Throughout the state, there are more than 100 active faults that
have produced earthquakes resulting in widespread damage and
deaths. In Southern California alone, since 1933, there have been
23 significant quakes of magnitude 5.9 or greater. The San
Andreas Fault, the major fault line running through California,
is expected to be the source for a major earthquake. It was the
source for the earthquake that leveled San Francisco in 1906.
Water infrastructure is vulnerable to earthquakes:
* In the Sacramento-San Joaquin Delta, man-made levees
dating back to 1850 are identified as at risk when a major
earthquake hits.
* The U.S. Geological Survey (USGS) estimates a magnitude
7.8 temblor on the southern portion of the San Andreas Fault will
cause major damage to infrastructure, including water lines and
dams.
A panel of experts in Southern California also has identified the
following risks as a result of a major earthquake:
* Likely major damage to the main aqueducts bringing water
to Southern California from Northern California and the Colorado
River. Repairs may be hampered due to damaged roads and
large-scale fires.
* In the following days after a major quake, there may be
no water available due to infrastructure breaks and loss of
power. After that, repairs will bring supplies online slowly.
Water districts and agencies have prepared earthquake
preparedness and emergency plans to address the emergency.
Also, groundwater basins will be used as emergency reservoirs to
make up the water shortages when imported supplies are
unavailable.
The agreement was likely spurred by recent struggles to provide
assistance following hurricane events, especially Hurricane
Maria in Puerto Rico, and other infrastructure failures such as
those experienced at the Oroville Dam in 2017.
California is at the epicenter of major natural and human
created disasters. At the top of that list are fires, floods
and earthquakes. … As fire season is now upon us, with
warnings of excessive heat, Mark Ghilarducci, the director of
Cal OES joins Insight to talk about fire, floods and
earthquakes.
The added water volume means crews contracted by the U.S. Army
Corps of Engineers are having to pull back from where they had
been working on the lake’s auxiliary dam, its service spillway
and the lake’s emergency spillway, said the corps’ project
manager, Anthony Burdock.
Del Puerto Water District and Central California Irrigation
District have developed the reservoir project without many
public concerns rising to the surface. That was until Patterson
city staff members showed up for Wednesday’s meeting. Maria
Encinas, a city management analyst, asked about a risk
assessment for adjacent communities like Patterson. A failure
in the dam on Del Puerto Creek, on the west side of Interstate
5, would appear to flood part of the city of 23,700, including
perhaps the downtown area in Patterson.
Federal engineers are raising alarms that a “significant flood
event” could breach the spillway of Southern California’s aging
Prado Dam and potentially inundate dozens of Orange County
communities from Disneyland to Newport Beach. After conducting
an assessment of the 78-year-old structure earlier this month,
the U.S. Army Corps of Engineers announced that it was raising
the dam’s risk category from “moderate” to “high urgency.”
By monitoring tiny changes to the Earth’s gravitational field,
the GRACE satellites have been pinpointing the distribution of
fresh water on our planet for almost two decades. But as Marric
Stephens explains, a new follow-on mission is also helping with
plans for a space-based gravitational-wave detector
The construction doubled the previous width of the dam from the
top to the bottom of the buttress, which was previously
susceptible to seismic activity. New valves and pipelines were
also included to control the lake level and allow for quicker
drainage in the event of an emergency.
In 2017, a swarm of seismic activity occurred near California’s
Long Valley Caldera in the Mammoth Mountain area. During the
same period of seismic activity, the area had high levels of
flooding due to snowmelt. The 2016-2017 winter brought heavy
snow that created one of the largest snowpacks ever recorded in
California’s history. A record amount of snowfall occurred in
the same region this year, raising the question of whether the
same occurrence will happen in 2019.
A spring surge of meltwater, seeping through vertically tilted
layers of rock, caused a seismic swarm near California’s Long
Valley Caldera in 2017, according to research presented at the
2019 SSA Annual Meeting. The unusual event prompted U.S.
Geological Survey researcher Emily Montgomery-Brown and her
colleagues to look back through 33 years of seismic and water
records for the region. They found that rates of shallow
seismicity were about 37 times higher during very wet periods
versus dry periods.
Work to protect Lake Gregory from a disastrous earthquake is
done. And, just in time for summer. Crews recently finished
retrofitting the 80-year-old seismically unsound dam that
protects the lake, at the heart of Crestline, bringing an end
to years of traffic, noise and other impacts — current and
potential — on the unincorporated mountain community.
Dozens of computer coding teams from around San Joaquin County
were tasked to create an app in roughly seven hours. The issue:
following the destruction caused by the malfunction of the
Oroville Dam in February 2017 and the evacuation of more than
180,000 people, could there be an app that can track dam
leakage, seismic activity and other structural impacts and
communicate with the appropriate individuals to help deter
another disaster?
Oregon’s dam safety regulations are getting an overhaul, for
the first time in nearly a century. A bill pending in the
Legislature would rewrite the laws governing construction,
inspections and enforcement authority for hundreds of
state-regulated dams. The bill would increase the state’s power
to force owners of aging, dangerous dams to do maintenance and
make repairs. And it would require state approval and oversight
of all new dam construction and removal of old dams.
Just months before the Woolsey Fire, Las Virgenes Mutual Water
District had joined CalWARN, a mutual assistance system set up
for water utilities. General manager Dave Pedersen had heard
about it from a neighboring agency. Before dawn Nov. 9, the
district requested emergency generators. Within a few hours,
they had gotten a response.
Southern California gets much of its water supply from Northern
California – so what will happen if the “Big One” – a major
earthquake – cuts that supply off? KVCR’s Benjamin Purper
finds out in this report.
Scientific monitoring in the Pacific Ocean, using buoys to take
seawater temperatures, screeched to a halt when the government
recently shut down for 35 days. But those efforts to monitor El
Nino, the warming of the equatorial Pacific Ocean that affects
global weather patterns, are just some of the shutdown’s
impacts on science that Kevin Trenberth describes.
A coalition of environmental groups has called on California
members of Congress to prioritize the San Luis (B.F. Sisk)
Dam seismic remediation over federal funding for new California
dams. San Luis Dam is in a very seismically active area.
Independently reviewed risk assessments for Reclamation have
shown that a large earthquake could lead to crest settlement
and overtopping of the dam, which would result in large
uncontrolled releases and likely dam failure.
The earthquakes hit just days after last year’s
near-catastrophe at Oroville Dam, when the spillway cracked
amid heavy rains and 188,000 people fled in fear of flooding.
The timing of the two small tremors about 75 miles north of
Sacramento was curious, and frightening.
At 8:29 a.m. on Nov. 30, part of the rock slab underneath the
Pacific Ocean 7 miles north of Anchorage, Alaska, shifted,
causing a magnitude 7 earthquake. As Anchorage was preparing
for the day, the quake ripped apart roads, shattered windows
and ruptured water and gas lines in and around the city.
A leading earthquake expert says San Diego should consider
accelerating replacement of aging water pipes and completing a
comprehensive inventory of local buildings, especially
structures made of unreinforced brick. … She [Dr. Lucy
Jones] said the water system is typically a city’s most
vulnerable point in an earthquake because shifting ground
cracks pipes, potentially depriving a recovering community of
its crucial water supply.
A ballot measure that would give San Francisco the money to
start rebuilding the Embarcadero seawall was approved by voters
Tuesday by a comfortable margin. Proposition A, which needed a
two-thirds vote to pass, had nearly 82 percent support, with
206,446 ballots tabulated.
The San Andreas fault begins its dangerous dance through
California at the Salton Sea, at a spot that seismologists long
have feared could be the epicenter of a massive earthquake. …
A muddy spring mysteriously has begun to move at a faster pace
through dry earth — first 60 feet over a few months, and then
60 feet in a single day, according to Imperial County
officials.
In recent decades, San Franciscans have embraced the reborn
Embarcadero waterfront as kind of front yard, and at noon on a
weekday it crowds with tourists, skateboarders, entrepreneurs
and other locals. But underneath wheels and feet, three and a
half miles of seawall is cracking and crumbling, vulnerable to
rising waters or a major earthquake.
Tom Heaton thought it was crazy when, back in the 1970s, he
first heard about the concept of an earthquake early warning
system. Japan’s high-speed rail system already was using the
technology to slow down trains before shaking from a distant
earthquake hit. But the more the young Caltech scientist did
his calculations, the more he dreamed of bringing the system to
California.
Automated alerts from the fledgling West Coast earthquake early
warning system are ready to be used broadly by businesses,
utilities, schools and other entities but not for mass public
notification, officials said Wednesday.
More than a dozen years have passed since the U.S Army Corps of
Engineers became concerned about water seeping through the
auxiliary dam at Isabella Lake — not to mention the possibility
of a massive earthquake leveling the earthen structure.
“We will be able to reproduce earthquake motions with the most
accuracy of any shake table in the world,” said Joel Conte, the
UC San Diego structural engineer who is overseeing the project.
“This will accelerate the discovery of the knowledge engineers
need to build new bridges, power plants, dams, levees,
telecommunication towers, wind turbines, retaining walls,
tunnels, and to retrofit older structures. …”
As an earthquake warning system becomes a reality for more
Californians, a big question arises: What can you do if you
know shaking is coming to you? … 8. Beneath a dam Get to
high ground.
Along the California coast and across the world, dozens of
deep-sea ocean sensors are a first line of defense that warns
officials when a devastating tsunami is coming. When an
earthquake strikes, the sensors capture the movement of the
ocean waters, giving authorities precious time to alert
residents to move to higher ground.
After toiling away in the remote hills east of Interstate 680
on the Alameda-Santa Clara county line for seven years,
hundreds of construction workers have finally finished the
largest dam built in the Bay Area in 20 years. The 220-foot
tall dam at Calaveras Reservoir — as high as the roadway on the
Golden Gate Bridge soars above San Francisco Bay — replaces a
dam of the same size, built in 1925.
San Francisco water officials were inspecting for earthquake
damage Monday at a dam under construction in the South Bay
after a small temblor shook the area the night before.
California’s nascent earthquake early-warning system had
another successful run Tuesday night when a 4.4 magnitude
temblor hit the La Verne area. The quake was too small to cause
much damage but was felt over a wide area.
Horror tales from recent earthquakes overseas are moving people
in Seattle, Portland and along the Pacific Northwest coast to
give a crap about where to crap after a major earthquake. It’s
not something we typically discuss in polite company, but
disaster planners say that when water and sewage service fails,
finding a place to poop is a big deal.
Research suggests the magnitude 6.0 earthquake that rocked
California wine country in 2014 may have been caused by an
expansion of Earth’s crust because of seasonally receding
groundwater under the Napa and Sonoma valleys.
On the ground once marked by devastation, a new city is rising.
The 1989 Loma Prieta earthquake battered the gritty South of
Market district, damaging the Embarcadero Freeway that walled
off downtown San Francisco from the bay and left city leaders
with a choice: Do they repair and retrofit it, or envision
something bolder?
Scientists have long held out hope that major earthquakes might
be predictable from their “foreshocks” — the smaller tremors
that often occur right before a major quake. But a new study
suggests that the foreshock theory is, well, shaky.
When a catastrophic earthquake hits California, buildings will
topple and potentially hundreds could be killed. But what gets
less attention is the wrenching aftermath of such a huge
temblor, which could leave whole neighborhoods torched by fires
uninhabitable and hundreds of thousands of people without a
home.
Lassen Peak had been rumbling for days. Glowing hot rocks
bounded down the slopes. Lava was welling up into a freshly
created crater. Then, on this day 103 years ago, it exploded in
a way California would never forget.
The town of Mammoth Lakes, in California’s eastern Sierra
Nevada, is generally known for two things: epic skiing in
winter, thanks to the very high elevation of its ski mountain;
and volcanic activity, because the mountain is a simmering
volcano. It’s normal to hike or ski around Mammoth and smell
the sulfurous gases venting from gurgling magma deep under the
mountain. That magma is also a rich source of geothermal power.
A swarm of small earthquakes hit a town near the U.S.-Mexico
border Saturday and continued into Sunday. Dozens of quakes
were reported in and around Ocotillo Wells in Imperial County,
six of them larger than a magnitude 3, according to the U.S.
Geological Survey.
A magnitude 4.2 earthquake struck about 3 miles northwest of
the Geysers geothermal field Wednesday evening and was followed
by a series of aftershocks, the U.S. Geological Survey said.
… The Geysers region, about 90 miles north of San
Francisco, is one of the most seismically active regions in the
United States.
Seismologist Lucy Jones said on Twitter that the temblor
occurred in a “complex part” of the San Andreas fault under the
San Bernardino Mountains and was not far from the epicenter of
a 1986 quake that measured 5.9 magnitude.
The water is rising. Closures are lifting. And enthusiasm is
building. After more than a decade of planning, construction
and disappointing water levels, Lake Perris is on its way to
being the recreational paradise it was before fears that its
dam would collapse in an earthquake significantly curtailed
activities.
Why was an earthquake in Virginia felt at more than twice the
distance than a similar-sized earthquake in California? The
answer is one that many people may not realize. Earthquakes
east of the Rocky Mountains can cause noticeable ground shaking
at much farther distances than comparably-sized earthquakes in
the West.
The U.S. Geological Survey over the last year has recorded
dozens of weak and shallow earthquakes near Oroville Dam and
its spillways. And nearly all the tremors — including a
magnitude-0.8 quake recorded Wednesday — share the same
designation: “Chemical explosion.”
Property values are soaring to stratospheric levels. The tech
economy is booming, fueling fast-paced development and spending
on home renovations that ranks among the nation’s highest. But
at a time of unparalleled prosperity in the Bay Area, there is
growing concern that the region is not using more of its
largesse to prepare for its greatest natural threat: a major
earthquake.
Eight hundred deaths, 18,000 people injured, more than $82
billion in property damage and business losses, and 400 fires
that would claim more lives and permanently alter the urban
landscape of the San Francisco Bay region.
As is often said, it’s not a matter of if, but of when, a large
earthquake strikes the heart of one of California’s most
densely populated regions. State officials and local agencies
know the clock is ticking, and mile by mile, pipe by pipe, work
crews are replacing or retrofitting water lines throughout much
of the Los Angeles and San Francisco Bay areas. Upgrades have
also been made in the Sacramento-San Joaquin Delta …
A landmark report by the U.S. Geological Survey estimates that
at least 800 people could be killed and 18,000 more injured in
a hypothetical magnitude 7 earthquake on the Hayward fault
centered below Oakland. … More than 400,000 people could
be displaced from their homes, and some East Bay residents may
lose access to clean running water for as long as six months.
Sailors arriving in San Francisco in the 19th century used two
giant redwood trees perched on a hill to help guide their ships
into the bay. The redwoods were felled for their lumber at
around the time of the gold rush, but San Francisco now has a
new beacon: Salesforce Tower, the tallest office building in
the West.
Earthquake activity in California’s Channel Islands shouldn’t
be all that surprising. After all, earthquakes created the
Channel Islands. In fact, mountains throughout California are
generally creations of earthquakes, seismologist Lucy Jones
said.
The 5.3 magnitude off the coast of Southern California didn’t
do damage on the mainland, but it appears have caused some
earth movement on Santa Cruz Island.
The Bay Area’s deeply unequal cities, home to mansions and
shacks alike, are linked by one thing: thirst. Banding
together, the region’s water agencies on Tuesday unveiled the
latest upgrades to a vast network that connects six million
people and provides mutual aid in a crisis, such as an
earthquake or severe drought.
A number of cities big and small in Southern California are
taking steps to identify seismically vulnerable buildings for
the first time in a generation, acting in part on the
devastating images of earthquake damage in Mexico and elsewhere
around the world.
California’s seismic construction requirements are designed to
protect the lives of those inside. But even with the most
modern codes, building to the state’s minimum requirements
would leave even new buildings severely damaged in a major
earthquake — to the point of being a complete loss.
The Marin Municipal Water District will spend $400,000 to
protect a key treatment plant in case of a big earthquake. The
district’s San Geronimo Water Treatment Plant in Woodacre
provides half of the water supply to the county, but two
circular clarifiers were built prior to current seismic
standards and stand vulnerable to a large temblor.
Mexico City got a substantial warning before the shaking from a
distant earthquake arrived Friday — some 30 to 60 seconds
broadcast over loudspeakers from an earthquake early warning
system. It was another success for Mexico City’s earthquake
warning system — one which California, Oregon and Washington
state still lack, and one that is an ongoing target for
elimination by President Trump.
Nearly three-quarters of San Francisco voters would support a
bond measure of up to $500 million to improve the city’s
disintegrating seawall, a piece of infrastructure that is
largely unseen but that experts say is of vital importance in
protecting the city against major earthquakes as well as sea
level rise.
If an earthquake similar to the one in 1906 shook the San
Francisco Bay Area, nearly 69,000 houses would likely be
uninhabitable and more than 200,000 people could be displaced,
according to a new report.
In a fast-growing Inland Empire churning out new housing
tracts, the city of Redlands is a throwback to an older, more
regal era. The college town is graced by historic mansions, old
orange groves and a vintage downtown that stands in deep
contrast to the region’s big-box shopping centers and
drive-thru eateries.
There’s been a shakeup in Riverside’s earthquake preparation
plans. Riverside Public Utilities signed a 90-day,
$45,000, contract with “earthquake lady” Lucy Jones in
November.
California earthquakes are a geologic inevitability. The state
straddles the North American and Pacific tectonic plates and is
crisscrossed by the San Andreas and other active fault systems.
The magnitude 7.9 earthquake that struck off Alaska’s Kodiak
Island on Jan. 23, 2018 was just the latest reminder of major
seismic activity along the Pacific Rim.
The strong earthquake off the coast of Alaska on Monday caused
1-foot waves in Devils Hole, a water-filled cave that’s home to
critically endangered pupfish in Death Valley National Park.
New data from state geologists show that an earthquake fault
runs below Rodeo Drive and Beverly Hills’ shopping district,
heightening the known seismic risk in an area famous for
Cartier, Gucci, Prada and other luxury brands. The California
Geological Survey’s final map has the Santa Monica fault zone
cutting through the so-called Golden Triangle, running between
Santa Monica and Wilshire boulevards.
A magnitude-7.9 earthquake in the Gulf of Alaska triggered
minimal tsunami activity Tuesday morning, but if the event
occurred 100 miles to the north, it might have unleashed a
monster tidal wave.
This month’s tragic mudslides in Montecito, California are a
reminder that natural hazards lurk on the doorsteps of many
U.S. homes, even in affluent communities. Similar events occur
every year around the world, often inflicting much higher
casualties yet rarely making front-page headlines.
South Reno has been shaking, ever so gently, for six days now.
If you live there — near Galena High School or where the Mount
Rose Highway goes below the I-580 — you likely haven’t felt
much, if anything. But earthquake detecting instruments in the
area have picked up more than 230 small temblors since late
last Thursday.
Scenic hill slopes can be inspiring – or deadly, as we are
seeing after the disastrous debris flows that have ravaged the
community of Montecito, California in the wake of heavy rains
on Tuesday, Jan. 9, 2018. … As mountains rise, erosion tears
them down. And Southern California’s mountains are rising fast,
squeezed up by the action of the region’s active faults.
Per EBMUD’s standard response protocols after an earthquake,
staff conducted inspections of the water treatment plants,
wastewater treatment plant, and other critical facilities.
t was a sharp jolt but also a warning of something much more
violent that could be coming. An estimated 9.8 million people
felt a magnitude 4.4 earthquake that rumbled across the Bay
Area early Thursday, the U.S. Geological Survey reported.
An earthquake centered in the Berkeley-Oakland area shook the
Bay Area at 2:39 a.m. Thursday, according to the U.S.
Geological Survey. The 4.4 shaker, near the Claremont Hotel in
the East Bay Hills, was along the Hayward Fault about 8 miles
deep, the USGS said.
A series of small earthquakes broke Wednesday and early
Thursday about eight miles northeast of Julian, causing shaking
that was felt across a wide area of the county, the U.S.
Geological Survey said
The San Jacinto fault may not be shaking yet, but it’s
trembling. And if it goes, according to one study, it could
rupture along with the San Andreas fault–producing a
catastrophic earthquake.
When the Big One hits California – and seismologists say
it’s not if, but when – there might not be blaring sirens or
vibrating phones giving people a precious few seconds to
prepare. … California’s earthquake warning system, long
discussed and partially built, remains incomplete and in limbo.
The 7.1 magnitude earthquake that shattered buildings and left
more than 200 dead in and around Mexico City is another
powerful reminder of what could happen when — not if — another
major temblor strikes the Bay Area.
Scientists say it’s possible for Southern California to be hit
by a magnitude 8.2 earthquake. Such a quake would be far more
destructive to the Los Angeles area because the San Andreas
fault runs very close to and underneath densely populated
areas. … The aqueducts that bring in 88% of Los Angeles’
water supply and cross the San Andreas fault all could be
damaged or destroyed, [Lucy] Jones said.
San Diego’s Rose Canyon fault is capable of producing a
magnitude 6.9 earthquake that could kill 2,000 people and
inflict $40 billion in property damage, according to a
preliminary study sponsored by the Earthquake Engineering
Research Institute. … The shaking would break scores of
water and sewer lines, possibly causing wastewater to spill
into San Diego and Mission Bays.
One day, next to the traffic map and weather forecast on your
smartphone, seismologist Thomas H. Jordan envisions an app that
you can check to see when the chances of a major earthquake in
California rise. Jordan, director of the Southern California
Earthquake Center, is quick to make clear this is not an
earthquake prediction.
For years, scientists have drawn up terrifying scenarios of
widespread destruction and chaos that would come to Southern
California when a catastrophic earthquake hits. … While epic
flooding is different from a powerful temblor, both natural
disasters fundamentally alter daily life for months or years.
A pair of earthquakes struck Northern California Tuesday
morning, including a magnitude 3.0 shaker off the coast of San
Francisco, according to the U.S. Geological Survey.
Congress has been pushing back against cuts in seismic safety
funding proposed in President Trump’s budget. First, a
congressional panel voted last week to keep funding a West
Coast earthquake early warning system that could have been shut
down under the proposed budget.
Engineers will use UC San Diego’s shake table to subject a
two-story structure to the forces produced by the 6.7
Northridge earthquake to look for ways to design tall wood
buildings that can survive big temblors.
The historically restless Mammoth Lakes area has experienced
more than 150 tiny and small earthquakes over the past week,
including a magnitude 3.0 temblor that hit at 7:13 p.m. on
Monday, says the USGS.
Elected officials from both parties have supported an
earthquake early warning system for the West Coast that, after
years of work, was scheduled to begin its first limited public
operation next year. … One of the system’s biggest proponents
is a Republican congressman who has an influential role in
shaping the budget of the U.S. Geological Survey.
Experts can’t predict earthquakes, but they can warn you that
they’re coming. For a dozen years, West Coast scientists
working with the United States Geological Survey have been
developing an earthquake early warning system — called
ShakeAlert — that could provide anywhere from a few seconds to
a few minutes of warning not only about the shaking that’s
imminent but also about its intensity.
California’s Mediterranean climate, with its wet winters and
dry summers, brings enviable weather to the Golden State but
also earthquakes, according to UC Berkeley research.
In 2015, Steven Horowitz was watching one of the summer’s big
blockbuster action flicks, San Andreas. In the movie, the San
Andreas fault shifts, triggering a magnitude 9.6 earthquake in
San Francisco. Disaster ensues — and for the rest of the movie
we watch as all of the West Coast’s greatest landmarks are
destroyed one by one in an epic, computer-generated spectacle.
New research released this week found that a fault under the
heart of San Diego can produce stronger and more frequent
earthquakes than previously thought. It’s the second study in
recent months pointing to heightened quake risks in the San
Diego area.
President Trump’s budget would eliminate federal funding for an
earthquake early warning system being developed for California
and the rest of the West Coast which, if enacted, probably
would kill the long-planned effort. The budget proposal for the
year ending in September 2018 also seeks to eliminate U.S.
funding for critical tsunami-monitoring stations in oceans and
reduce funds for a next-generation weather forecasting system.
New earthquake sensing stations are being installed in the
ground, software is being improved, and operators are being
hired to make sure the system is properly staffed, Caltech
seismologist Egill Hauksson said at a joint meeting of the
Japan Geoscience Union and American Geophysical Union.
The budget deal reached in Congress this week penciled in $10.2
million for an earthquake early warning system for California
and the rest of the West Coast for the budget year that ends in
September.
The Santa Monica City Council on Tuesday passed the nation’s
most extensive seismic retrofitting effort, which will require
safety improvements to as many as 2,000 buildings suspected to
be vulnerable in an earthquake.
The Newport-Inglewood fault has long been considered one of
Southern California’s top seismic danger zones because it runs
under some of the region’s most densely populated areas, from
the Westside of Los Angeles to the Orange County coast.
After all, California was soaked with ridiculous amounts of
rain this winter and then over the past week, dry, warm
weather, with temps in the 80s recorded in some places, has
baked the state. Could these extreme conditions trigger seismic
activity?
The discovery of missing links between earthquake faults shows
how a magnitude 7.4 earthquake could rupture in the same
temblor underneath Los Angeles, Orange and San Diego counties,
a new study finds.
The Scripps Institution of Oceanography has re-characterized
the Newport-Inglewood and Rose Canyon faults, saying that they
represent a single system that could produce a magnitude 7.3
quake if their offshore segments ruptured. Scientists also say
that the quake could hit 7.4 if the southern section of the
system, which cuts through parts of San Diego, also broke.
Southern California could be overdue for a major earthquake
along the Grapevine north of Los Angeles, according to a
sobering new study by the U.S. Geological Survey. The research
found earthquakes happen there on average every 100 years.
In its annual national earthquake outlook, the U.S. Geological
Survey reported Wednesday that a large portion of Oklahoma and
parts of central California have the highest risk for a
damaging quake this year: between 5 and 12 percent. The outlook
is published in the journal Seismological Research Letters.
Water Education for Latino Leaders is convening a statewide
educational water conference in Sacramento for California local
elected officials.
Local elected officials can make a difference for all
Californians by taking the necessary steps to understand the
dynamic of California water to assure adequate clean water for
our communities, protect our natural resources and our local
economies. WELL’s hope is to facilitate understanding towards
comprehensive long-term water policies that will sustain
California’s economy and quality of life.
The Water Education Foundation is an organizing partner.
San Francisco voters will be asked to allow $350 million to be
spent on a first round of improvements for the city’s crucial
but fragile Embarcadero seawall, officials said Monday.
A swarm of more than 250 small earthquakes have struck since
New Year’s Eve near the California-Mexico border,
causing unease among residents and attention from
scientists.
A magnitude 5 earthquake Wednesday morning jolted The Geysers
region of Northern California, a rural area about 70 miles
north of the San Francisco Bay Area.
Reflecting problems at other aging reservoirs, a $200
million project to drain and repair one of the Bay Area’s
largest dams to reduce the risk of it collapsing in a major
earthquake will double in cost and be delayed by at least two
more years.
A powerful magnitude 6.5 earthquake rocked the Northern
California coast Thursday morning. … Seismologist Lucy
Jones said the earthquake early Thursday was on the
Pacific-Gorda plate on the end of the San Andreas Fault.
Update: The following information has been posted by the
Redwood Coast Tsunami Work Group: An update on this morning’s
earthquake: • Magnitude revised to 6.5 • 98 miles WNW of
Petrolia, 100 miles W of Ferndale, 105 miles WSW of Eureka
While most spend their Thanksgiving holiday visiting family and
friends around a table of delicious food, Humboldt State
geology department chair Mark Hemphill-Haley took off early for
a 10-day reconnaissance mission examining New Zealand’s
magnitude 7.8 earthquake that struck Nov. 13.
A sobering new report on California’s seismic vulnerabilities
said that up to 3.5 million homes could be damaged if an 8.0
earthquake ruptured on the San Andreas fault.
A 7.8 earthquake along the infamous San Andreas fault hit
Southern California at 3:10 a.m. Monday. … Fortunately, this
is only a drill to ensure that emergency response agencies will
be ready when – not if, according to experts – the Big One
hits.
Cracked hunks of concrete are all that remain of a six-story
hotel after a catastrophic magnitude 7.8 earthquake that has
left hundreds of thousands of people dead.
The Long Beach quake, the deadliest in Southern California
history, focused attention like never before on the seismic
dangers the region faces. But a new study suggests that the
quake may have been caused by another factor: Deep
drilling in an oil field in Huntington Beach.
The Dr. Lucy Jones Center for Science and Society will
officially form in January, but Jones is already working with
the Southern California Association of Governments and the
Structural Engineers Association of Southern California to help
governments and businesses prepare for a major earthquake so
they can get back on their feet quickly once the damage is
done.
The most dangerous earthquake fault in the San Francisco Bay
Area is connected to another, which means both could rupture
simultaneously and unleash major devastation, a new study
finds.
The Bay Area’s job boom has intensified the economic calamities
that could be unleashed by a big earthquake along the Hayward
Fault in the East Bay, federal officials warned on Monday.
The swarm of temblors in late September beneath the Salton
Sea put Los Angeles on heightened alert and caused public
officials to remind Angelenos about stockpiling water,
shutting off gas valves, and remembering to “drop and
cover.”
Scientists in California have found that earthquakes can
occur much deeper below the Earth’s surface than originally
believed, a discovery that alters their understanding of
seismic behavior and potential risks.
Southern Californians learn to live with the risk of
earthquakes. But over the last week, anxieties were
particularly heightened, and the natural denial that is part of
living in earthquake country was harder to pull off.
The rumbling started Monday morning deep under the Salton Sea.
… The temblors were not felt over a very large area, but they
have garnered intense interest — and concern — among
seismologists.
Governor Jerry Brown has signed a bill creating a program for a
statewide earthquake early warning system in California. State
Senator Jerry Hill authored the legislation.
It’s been about eight years since the Salton Sea was the
epicenter of a swarm of earthquakes, but the abundance of
temblors doesn’t necessarily indicate a larger one to
come, a renowned seismologist says.
Researchers at the Berkeley Seismological Laboratory and the
campus department of earth and planetary sciences gained new
insight into the movement of tectonic plates as a result of the
multi-year study published Friday in the journal Science.
UC San Diego has found evidence that large
earthquakes can quickly produce powerful and potentially
dangerous aftershocks on nearby faults, an insight that
could aid experts planning for how to deal with seismic hazards
in California.
In the Bay Area, more than $22 billion in infrastructure
upgrades since Loma Prieta have built a metropolitan area that
is far safer and far more resilient than before. Major water
pipes are now designed to bend, not break.
Scientists say data from earth movements that occurred after
the major shaking stopped show helter-skelter patterns unlike
anything they’ve seen before.
The gravitational tug between the sun and moon is not just a
dance of high and low tides: It can also trigger a special kind
of earthquake on the San Andreas fault.
For nearly half a century, thousands trekked to Rose and
Prospect streets to behold a slice of sidewalk that, by
conventional standards, had no curb appeal.
Facing threats of earthquakes, wildfires and floods, almost
200 Southern California cities depend too much on big
government to protect them, which will lead to slower recovery
time when “the big one” hits, according to experts on disaster
preparedness.
U.S. Bureau of Land Management senior geologist Gregg Wilkerson
was happy to respond Wednesday to a new study showing the
Bakersfield area slowly sinking and other areas in California
slowly rising as a result of seismic strain from
the San Andreas Fault.
Cutting beneath the lower Mississippi River, the New Madrid
fault is a T-shaped geological hazard that is primed for a
fierce tremor. A magnitude 7.7 earthquake where the fault
crosses the Missouri-Tennessee border would be devastating,
snapping water distribution pipes and toppling power lines in
seven states, as far as 200 miles from the epicenter.
For the first time, scientists have produced a computer image
showing huge sections of California rising and
sinking around the San Andreas fault. …The breakthrough
accomplished by [Sam] Howell and his team involved writing a
computer code that filtered out how the land was rising or
falling from non-seismic factors.
Findings published in the journal Nature Geoscience
indicate a “small-amplitude, but spatially considerable,
coherent pattern of uplift and subsidence straddling the fault
system in southern California.”
The Pacific Northwest kicks off a massive earthquake and
tsunami drill Tuesday as part of a multiday event to rehearse
scenarios on how the region would deal with a dual natural
disaster that could kill thousands, cut off coastal
communities, and collapse phone and internet service.
On Tuesday, as many as 20,000 people across Washington, Oregon,
California and Idaho, mainly federal employees, will begin a
four-day exercise called “Cascadia Rising” — a trial run at
responding to a massive magnitude 9.0 quake on the Cascadia
Subduction Zone off the northwest coast near here, and the
tsunami that would inevitably accompany it.
In a major reversal, Gov. Jerry Brown is seeking state funds
for a fledgling earthquake early warning system for California,
which would allow for a limited rollout of alerts by 2018.
San Francisco Mayor Ed Lee has proposed spending $8 million to
find a solution to the earthquake-vulnerable sea wall that
holds up the city’s famed Embarcadero waterfront.
Southern California’s section of the San Andreas fault is
“locked, loaded and ready to roll,” a leading earthquake
scientist said Wednesday at the National Earthquake Conference
in Long Beach. … Other areas of focus have included
strengthening Los Angeles’ vulnerable aqueduct systems and its
telecommunications networks.
Scientists say the Sierra’s eastern front is long overdue for a
large earthquake along the California-Nevada line, where a
magnitude-7 event expected on average every 30 years hasn’t
occurred in six decades.
In a significant step for the largest reservoir project in the
Bay Area in 20 years, workers have finished building the
spillway — a massive concrete channel as wide as eight
lanes of freeway and a quarter mile long — at Calaveras Dam
near the Alameda-Santa Clara county line.
The Rancho California Water District is looking into the
feasibility of building a new dam at Vail Lake to augment the
existing structure, a 68-year-old mass of concrete that has
been deemed “deficient” by a state agency.
Californians have lived with the risk of a damaging earthquake
for centuries. Now Oklahomans, and some Kansans, face the same
threat, federal seismologists said on Monday.
The renowned U.S. Geological Survey seismologist Lucy Jones has
studied our earthquakes, and gone on television time and again
to give us information and comfort. Now the “Earthquake Lady”
is retiring – but still kind of wishing, in the nicest possible
way, for a chance to experience a Big One.
Now [Lucy] Jones hopes to leverage her earthquake credentials
to tackle even more ambitious projects. She’s retiring from the
USGS this month to help officials develop science-based
policies related to climate change, tsunamis and other kinds of
natural disasters.
Two of Southern California’s most active faults could rupture
together in a magnitude-7.5 earthquake, according to a new
study, raising a grim seismic scenario for communities east of
Los Angeles.
San Francisco is having a fire sale on spare parts for the
city’s 100-year-old emergency water supply system — the network
of high-pressure pipes and hydrants designed to help
firefighting efforts should city water mains fail in a major
earthquake.
More than five years after Oklahoma first saw a startling spike
in earthquakes linked to the disposal of huge volumes of
wastewater created by hydraulic fracturing for oil, the state
continues to shake at an unprecedented rate and the number of
strong quakes is increasing.
UC Santa Cruz researcher Thomas Goebel suggests that, in fact,
we do have induced earthquakes here. His latest paper, in the
journal Geophysical Research Letters, is a detailed study of an
earthquake swarm that occurred beneath the Tejon Oil Field
south of Bakersfield on September 22, 2005.
In the last 150 years, Washington state has experienced 15
major earthquakes, and scientists say it’s just a matter of
time before the next one strikes. To get ready, President
Barack Obama’s new budget plan includes $8 million to help
bring an early earthquake warning system online.
A 2005 spate of quakes in California’s Central Valley almost
certainly was triggered by oilfield injection underground, a
study published Thursday said in the first such link in
California between oil and gas operations and earthquakes.
When a magnitude 6.0 earthquake hit Napa in 2014, an earthquake
alert system gave researchers in San Francisco about eight
seconds of warning before the shaking began.
With officials still struggling to find money to create an
earthquake early warning system for the West Coast, a private
foundation, Intel Corp. and an arm of Amazon.com Inc. said they
will pitch in money or other support, officials said at a
White House summit Tuesday.
Seismologists say a full rupture of a 650-mile-long offshore
fault running from Northern California to British Columbia and
an ensuing tsunami could come in our lifetimes, and emergency
management officials are busy preparing for the worst.
State regulators ordered a few years ago that the vast lake
near Morgan Hill in Santa Clara County — which holds more water
than the other nine reservoirs in the county combined — could
not be filled any more than 68 percent full because geologic
tests found that in a major earthquake, its 240-foot high
earthen dam could slump, releasing a wall of water that could
generate a trail of death and destruction all the way to San
Jose.
The U.S. Geological Survey is raising serious doubts about
a recent study that calculates a 99.9% chance of a large
earthquake in the Los Angeles area in the next three years.
The quakes — ranging from the hardly perceptible magnitude 0.8
to a more robust 3.6 — have been occurring every few minutes to
every few hours, rattling residents in the surrounding
communities, particularly San Ramon.
U.S. Geological Survey seismologist Paul Earle and computer
scientist Michelle Guy are taking social media to a new level,
using Twitter to help detect earthquakes in real time as they
are felt across the globe.
A group of U.S. drilling states, seismologists, academics and
industry experts issued guidance Monday in a frank new report
on handling human-induced earthquakes caused by hydraulic
fracturing or the disposal of fracking wastewater.
Gov. Jerry Brown says California’s drought and the wildfires it
has spawned are wake-up calls about the potentially cataclysmic
effects of climate change. That may be true.
More than half a dozen water mains ruptured in the East Bay on
Monday, mostly in and around the areas affected by a magnitude
4.0 earthquake Monday morning, according to the East Bay
Municipal Water District.
An earthquake along the California coast could pose a greater
tsunami threat to the Ventura area than previously understood,
according to a new study published Tuesday by UC Riverside and
U.S. Geological Survey scientists.
The U.S. Geological Survey has awarded $4 million to help push
ShakeAlert, an earthquake early warning system, closer to
becoming a functioning $38.2 million network on the West Coast.
… The USGS last week announced it awarded about $4 million to
four universities: Caltech, UC Berkeley, University of
Washington and University of Oregon.
[Binod] Tiwari, a civil engineer at the Fullerton university,
has come to Nepal to help lead the Geotechnical Extreme Events
Reconnaissance team, which assesses the damage after
mega-earthquakes … Tiwari and the team, which is
supported by the U.S. National Science Foundation, are
examining every bit of infrastructure they come across —
bridges, roads, houses and hydropower projects.
The more oil and gas companies pump their saltwater waste into
the ground, and the faster they do it, the more they have
triggered earthquakes in the central United States, a massive
new study found.
A giant earthquake will strike California this summer.
Skyscrapers will topple, the Hoover Dam will crumble and a
massive tsunami will wash across the Golden Gate Bridge. Or at
least, that’s the scenario that will play out on the big screen
in San Andreas.
In the film, opening this Friday, a previously unknown fault
near the Hoover Dam in Nevada ruptures and jiggles the San
Andreas. … U.S. Geological Survey seismologist Susan Hough
accompanied The Associated Press to an advance screening of the
film.
Just how real is the earthquake threat to the Sacramento-San
Joaquin River Delta? … KCRA 3’s investigative unit talked
with experts on the issue and found very different viewpoints.
Despite concerns from some residents, scientists say two recent
earthquakes centered in the Baldwin Hills area — including one
Sunday morning — do not appear to be connected to drilling
operations at nearby oil fields.
East Bay Municipal Utility District crews were repairing a
minor break to a 12-inch steel water main at North Main Street
and Geary Road in Walnut Creek on Sunday night. The break was
reported at 4:15 p.m., but repair crews could not immediately
determine if the shaking caused the underground break to the
52-year-old water main, said EBMUD spokeswoman Tracie
Morales-Noisy.
Many studies have linked the rise in small quakes to the
injection of wastewater into disposal wells, but the Geological
Survey’s report takes the first comprehensive look at where the
man-made quakes are occurring.
For the first time, the U.S. Geological Survey has unveiled a
map of earthquakes thought to be triggered by human activity in
the eastern and central United States.
New research released Wednesday suggests that the shaking from
“the Big One,” the long-predicted major earthquake on the San
Andreas fault, could trigger additional large temblors on
nearby faults, intensifying the overall seismic impact.
Sen. Bob Hertzberg proposed a Water Seismic Safety (SB664) bill
on Tuesday requiring local water agencies to evaluate their
earthquake risks and suggest ways to keep the water flowing in
the event of a disaster.
It qualifies as the most cataclysmic event in the history of
Sonoma County. On the morning of April 18, 1906, the earth
moved, and downtown Santa Rosa was reduced to a pile of bricks.
