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
* 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
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
* 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
A massive earthquake in the central Aleutian Islands in Alaska
could send waves as high as 28 feet crashing into Rodeo Cove
near Sausalito, according to data presented Tuesday at Marin’s
first-ever tsunami preparedness symposium.
Mayor Eric Garcetti’s call to strengthen Los Angeles’ water
system — one pillar of his ambitious plan to ready the city for
a major earthquake — would cost as much as $15 billion and
require decades of work, Department of Water and Power
A new California earthquake forecast by the U.S. Geological
Survey and partners revises scientific estimates for the
chances of having large earthquakes over the next several
decades. The Third Uniform California Earthquake Rupture
Forecast, or UCERF3, improves upon previous models by
incorporating the latest data on the state’s complex system of
active geological faults, as well as new methods for
translating these data into earthquake likelihoods.
Reactivated faults that have produced thousands of Oklahoma
earthquakes are capable of causing larger seismic events,
according to U.S. Geological Survey research published today
[March 6] in Geophysical Research Letters. … Several
recent studies have linked Oklahoma earthquakes with the
injection of wastewater from enhanced oil and gas
The San Francisco Public Utilities Commission has opened
a new 3.5 mile-long tunnel in Sunol Valley, a few miles
east of Fremont, that will transport 265 million gallons of
water a day, on average, to customers of the Hetch Hetchy water
The fault that caused that Napa quake is forecast to move an
additional 2 to 6 inches in the next three years in a hard-hit
residential area, a top federal scientist said at a meeting of
the American Geophysical Union in San Francisco on Tuesday.
Los Angeles gets 88% of its water from three major aqueducts,
flowing from the Colorado River, Owens Valley and the
Sacramento-San Joaquin River Delta. … Officials have long
warned that a massive temblor on the San Andreas could destroy
key sections of the aqueducts, cutting off the water supply for
more than 22 million people in Southern California.
Los Angeles Mayor Eric Garcetti on Monday proposed the most
ambitious seismic safety regulations in California history —
rules that would require owners to retrofit thousands of
buildings most at risk of collapse during a major earthquake.
… Garcetti is also proposing sweeping plans to protect
aqueducts that supply L.A. with water and ensure firefighters
won’t be left helpless by ruptured pipes as fires burn through
Studies by the U.S. Geological Survey and university
researchers suggest that the increased number of temblors
coincides with the injection of wastewater deep underground,
which is part of the process in hydraulic fracturing.
On a map of the whole state, the great earthquake faults of
California look like a pretty simple set of lines that join and
divide in a loose tangle: the San Andreas Fault Zone.
… A new paper in the journal Tectonics (open access) has
begun to lay bare the intricate buried structure south of
Hollister where two major faults come together, the San Andreas
and Calaveras faults.
Marin is the 17th worst place to own a home in the country,
almost as bad as Hurricane Katrina-ravaged Forrest County,
Mississippi, according to a report from the Weather Channel
website weather.com. Earthquake, flood and wildfire risk
combined to land Marin in the list of America’s 50 worst places
to own a house based on natural factors.
It’s been 25 years since a massive quake rocked the Bay Area
just before a World Series game … There have been about
$30 billion worth of upgrades made to roads and water and
The Bay Area is booming, building and growing. But its 7
million residents live under a shadow: a future earthquake that
could devastate the region as much as — or more than — the Loma
Prieta tremor 25 years ago.
A massive earthquake in Southern California could economically
cripple the Los Angeles region, earthquake “czar” Dr. Lucy
Jones warned City Council members during a hearing Wednesday.
… A seismologist with the U.S. Geological Survey, Jones is
working for the city for free for 12 months, helping craft a
report on earthquake preparedness in building safety, water
issues and communication systems.
This week, the $288 million tunnel begins carrying the Bay
Area’s water supply from the Hetch Hetchy Reservoir in Yosemite
National Park to the Peninsula, bolstering the dependability of
the region’s water system.
Four highly stressed seismic faults in the Bay Area’s densely
populated San Andreas system are moving on the surface and
could rupture in a major earthquake at any time, according to
scientists tracking their movements. … The scientists’
report was published Monday in the Bulletin of the
Seismological Society of America.
A popular rock climbing area and other recreational facilities
on the southeast side of Lake Perris will be closed for three
years starting this week so that seismic work can begin on the
dam, state officials said.
In greater numbers by the month, residents across north Orange
County are calling for an end to fracking, joining a growing
chorus of Californians demanding a stop to the controversial
oil drilling practice.
An extensive Bay Area News Group survey of our infrastructure
offers much reassurance: Major water pipes are now designed to
bend, not break. … But our readiness to recover from the Big
One gets far from a perfect score — more like a C-plus, say
experts who study quake preparation around the globe.
15-minute DVD that graphically portrays the potential disaster
should a major earthquake hit the Sacramento-San Joaquin Delta.
“Delta Warning” depicts what would happen in the event of an
earthquake registering 6.5 on the Richter scale: 30 levee breaks,
16 flooded islands and a 300 billion gallon intrusion of salt
water from the Bay – the “big gulp” – which would shut down the
State Water Project and Central Valley Project pumping plants.
This beautifully illustrated 24×36 inch poster,
suitable for framing and display in any office or classroom,
focuses on the theme of Delta sustainability.
The text, photos and graphics explain issues related to land
subsidence, levees and flooding, urbanization and fish and
wildlife protection. An inset map illustrates the tidal action
that increases the salinity of the Delta’s waterways. Development
of the map was funded by a grant from the California Bay-Delta
The 24-page Layperson’s Guide to Flood Management explains the
physical flood control system, including levees; discusses
previous flood events (including the 1997 flooding); explores
issues of floodplain management and development; provides an
overview of flood forecasting; and outlines ongoing flood control
The 24-page Layperson’s Guide to the Delta explores the competing
uses and demands on California’s Sacramento-San Joaquin Delta.
Included in the guide are sections on the history of the Delta,
its role in the state’s water system, and its many complex and
competing issues with sections on water quality, levees, salinity
and agricultural drainage, and water distribution.
This issue of Western Water looks at the BDCP and the
Coalition to Support Delta Projects, issues that are aimed at
improving the health and safety of the Delta while solidifying
California’s long-term water supply reliability.