Transcript. 3- U.S. Geological Survey This report presents a map and database of Quaternary deposits and liquefaction susceptibility for the urban core of the San Francisco Bay region. To provide a micro- zonation of this hazard, maps have been prepared for various subregions of the United States. The map assumes the historically shallowest water table conditions and does not reflect current 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. Saratoga, and Sunnyvale. If the current water table is deeper, the probability of liquefaction is reduced. 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. The next update of the NSHM for the conterminous U.S. (CONUS) will be in 2023.What are the USGS National Seismic Hazard Maps and how are they used? current ground-water conditions. The models are based on seismicity and fault-slip rates, and take into account the frequency of earthquakes of various magnitudes. The map is based on the most recent USGS models for the conterminous U.S. (2018), Hawaii (1998), and Alaska (2007). Other potentially hazardous areas include those along some of the larger streams, which produce the loose young soils that are particularly susceptible to liquefaction.These new maps show a lower likelihood of liquefaction than previously thought in regions underlain by Bay mud that fringes many parts of San Francisco Bay. n/a. Saratoga, and Sunnyvale. ground-water conditions. Please use the older map for areas not covered by the new map. Eric Matthys. Locally, the hazard may be greater than shown, because site geology may amplify ground motions. This effect can be caused by earthquake shaking. The maps also contribute to the California Geological Survey’s The first is a new map of the young geologic deposits in the low-lying sections of the Bay Area. Soft muds shake much harder than bedrock. Wet sand can become liquid-like when strongly shaken. At each location, the map predicts the approximate probability that shallow wet sands will liquefy and cause surface manifestations of liquefaction such as sand boils and ground cracking. If the current water table is deeper, the probability of liquefaction is reduced. The maps also contribute to the California Geological Survey’s The first is a new map of the young geologic deposits in the low-lying sections of the Bay Area. Some of the young deposits strongly affect the strength of earthquake shaking that is transmitted through the deposits.Figure on left shows that the shaking experienced in a region depends very strongly on the type of deposits found near the surface. Locally, the hazard may be greater than shown, because site geology may amplify ground motions. 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 These maps are designed to give the general public as well as land-use planners, utilities and lifeline owners, and emergency response officials, new and better tools to assess their risk from earthquake damage. The map is based on the most recent USGS models for the conterminous U.S. (2018), Hawaii (1998), and Alaska (2007). Preliminary maps and spatial databases of Quaternary deposits, liquefaction susceptibility, and past earthquake ground effects in the 9-county San Francisco Bay region. Maps showing the probability of surface manifestations of liquefaction in the northern Santa Clara Valley were prepared with liquefaction probability curves. (Public domain.)


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