ABAG Earthquake Liquefaction Hazard Maps

Directions for viewing an earthquake liquefaction hazard map -
Liquefaction hazard is defined as a combination of liquefaction susceptibility and shaking that is strong enough to trigger liquefaction. Thus, to view an earthquake intensity map of your area, you need to both select an area (city) and select a fault as the source of the earthquake. Note: only maps of the region, not individual cities, are available for the two thrust faults at this time.

STEP 1 - Choose a city from the first window. Note: maps for individual cities are only available for four earthquake scenarios at this time. Thus, if you select several of the earthquake scenarios, you will still only get a map of the entire Bay Area. The four scenarios for which individual city maps are currently available are:

(1) North Hayward + South Hayward Segments of the Hayward-Rodgers Creek Fault System
(2) Rodgers Creek Segment of the Hayward-Rodgers Creek Fault System
(3) Santa Cruz Segment of the San Andreas Fault System
(4) Entire San Andreas Fault System.

STEP 2 - Choose a fault source for the earthquake scenario using the map by clicking on a colored fault segment on the map or on the button next to the fault name. You should find that the most interesting scenarios are the ones involving multiple fault segments on the San Andreas and Hayward faults, as well as the faults near you.

STEP 3 - Click on the "View Map" button at the bottom of this page.

Entire Bay Area Alameda Alamo Albany American Canyon Antioch Atherton Belmont Belvedere Benicia Berkeley Bethel Island Blackhawk Boyes Hot Springs Brentwood Brisbane Burlingame Calistoga Campbell Castro Valley Clayton Cloverdale Colma Concord Corte Madera Cotati Cupertino Daly City Danville Dixon Dublin East Palo Alto El Cerrito El Granada El Sobrante Emeryville Fairfax Fairfield Foster City Fremont Gilroy Glen Ellen Half Moon Bay Hayward Healdsburg Hercules Hillsborough Kensington Kenwood La Honda Lafayette Larkspur Livermore Los Altos Los Altos Hills Los Gatos Martinez Menlo Park Millbrae Mill Valley Milpitas Montara Monte Sereno Moraga Morgan Hill Moss Beach Mountain View Napa Newark Novato Oakland - East Oakland - North Oakley Orinda Pacifica Palo Alto Pescadero Petaluma Piedmont Pinole Pittsburg Pleasant Hill Pleasanton Portola Valley Redwood City Richmond Rio Vista Rodeo Rohnert Park Ross St. Helena San Anselmo San Bruno San Francisco San Carlos San Gregorio San Jose - North and Central San Jose - Northeast San Jose - Southeast San Jose - Southwest San Leandro San Lorenzo San Mateo San Pablo San Rafael San Ramon Santa Clara Santa Rosa Saratoga Sausalito Sebastopol Sonoma South San Francisco Stanford Suisun City Sunnyvale Tiburon Union City Vacaville Vallejo Walnut Creek Windsor Woodside Yountville

Select a fault by clicking on the map or on one of the buttons below. Scenarios in BLACK involve multiple fault segments. San Andreas-North Golden Gate San Andreas -- Peninsula San Andreas -- Santa Cruz Entire San Andreas (1906 Quake) Rodgers Creek Rodgers Ck + North Hayward North Hayward South Hayward North + South Hayward Northern Calaveras Central Calaveras Maacama West Napa Concord/Green Valley Greenville Mount Diablo (thrust fault) Northern San Gregorio Monte Vista (thrust fault)

ABAG, the Association of Bay Area Governments, is the regional planning and services agency for the nine-county San Francisco Bay Area. The liquefaction hazard map information was last updated by ABAG in April, 2001.

jbp 10/16/03