Locally, the hazard may be greater than shown, because site geology may amplify ground motions. Date Taken: 2014 (approx.)

Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. This effect can be caused by earthquake shaking. The California Geological Survey produces State-mandated regulatory maps that show “Zones of Required Investigation” for liquefaction (and landslide) hazard. These maps are the result of over a decade of work and collaboration between geologists from the consulting firm Many of the region’s utilities and lifeline owners have made use of an Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site. Liquefaction during large earthquakes commonly disrupts pipelines and road networks and also may cause buildings to settle and move downslope or toward stream banks.These new maps cover the San Francisco Bay region (outlined in red).

This map shows the liquefaction hazard in the communities of Alameda, Berkeley, Emeryville, Oakland, and Piedmont for a magnitude 7.1 earthquake on the Hayward fault. What do I need to know about earthquake hazards? Detailed mapping is needed to forecast where shaking will be strongest during future earthquakes.The second of the maps shows the likelihood that these young deposits will liquefy, or turn into a sandy liquid due to the strong shaking a big earthquake will produce. The map assumes the historically shallowest water table conditions and does not reflect The liquefied sand may flow and the ground may move and crack, causing damage to surface structures and underground utilities.The map depicts the hazard at a regional scale and should not The map includes the communities of San Jose, Campbell, Cupertino, Los Altos, Los Gatos, Milpitas, Mountain View, Palo Alto, Santa Clara, Preliminary maps and spatial databases of Quaternary deposits, liquefaction susceptibility, and past earthquake ground effects in the 9-county San Francisco Bay region. This map shows the likelihood of liquefaction in Northern Santa Clara County during a magnitude 7.8 earthquake on the northernmost segments of the San Andreas Fault. The liquefied sand may flow and the ground may move and crack, causing damage to surface structures and underground utilities. Liquefaction Hazard Maps Liquefaction, a process in which loose, granular soils below the ground water table temporarily lose strength during strong earthquake shaking, has been the cause of considerable damage during earthquakes.

Student Intern. Liquefaction is a phenomenon that is caused by earthquake shaking. Liquefaction Hazard Maps Liquefaction, a process in which loose, granular soils below the ground water table temporarily lose strength during strong earthquake shaking, has been the cause of considerable damage during earthquakes. The older map also shows locations of liquefaction observed in historical earthquakes, particularly the In addition, the California Geological Survey has zoned the greater San Francisco area for liquefaction hazard in their We can expect history to repeat itself in the next big Bay Area earthquake.The highest hazard areas shown by the liquefaction hazard maps are concentrated in regions of man-made landfill, especially fill that was placed many decades ago in areas that were once submerged bay floor.

The map includes the communities of San Jose, Campbell, Cupertino, Los Altos, Los Gatos, Milpitas, Mountain View, Palo Alto, Santa Clara, The area includes the communities of San Jose, Campbell, Cupertino, Los Altos, Los Gatos Milpitas, Mountain View, Palo Alto, Santa Clara, Saratoga, and Sunnyvale.

Wet sand can become liquid-like when strongly shaken. Wet sand can become liquid-like when strongly shaken.

The map assumes the historically shallowest water table conditions and does not reflect current Bay mud remains a seismic hazard because on the basis of its past performance in earthquakes it will produce stronger levels of shaking than other geologic units.The new maps show in unprecedented detail the nature of the materials that underlie areas of densest urban development and highlight areas that may be prone to shaking-related damage during future earthquakes. Detailed mapping is needed to forecast where shaking will be strongest during future earthquakes.The second of the maps shows the likelihood that these young deposits will liquefy, or turn into a sandy liquid due to the strong shaking a big earthquake will produce. A Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete. This earthquake is similar to the 1906 San Francisco earthquake. Liquefaction is a phenomenon that is caused by earthquake shaking. be used for site-specific design and consideration. n/a. To provide a micro- zonation of this hazard, maps have been prepared for various subregions of the United States.

Liquefaction takes place when loosely packed, water-logged sediments at or near the ground surface lose their strength in response to strong ground shaking.Liquefaction occurring beneath buildings and other structures can cause major damage during earthquakes. Please use the older map for areas not covered by the new map. Student Intern. This earthquake is similar to the 1868 Hayward earthquake. Most residents of the Bay Area live and work in these low-lying areas that are underlain by these young deposits.

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