In response to the Nisqually earthquake of 2001, the Survey was awarded a grant by FEMA and the Washington Emergency Management Division to develop two types of earthquake hazard maps for every county in the state—liquefaction susceptibility maps, which outline areas where water-saturated sandy soil loses strength during earthquake shaking, and NEHRP (National Earthquake Hazards Reduction Program) site class maps… The map is searchable by address, and it maps three main hazard zones: Fault zones Landslide zones Liquefaction zones The map also displays areas that have not yet been evaluated for 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. This ultimately leads to increased quality of life and work for San Francisco residents, employers, employees and visitors. These maps have been prepared under the auspices of the National Earthquake Hazards Reduction Program (NEHRP) by scientists and engineers within the U.S. Geological Survey, organizations sponsored by the USGS NEHRP External Research Pro- gram, and state government agencies.

High liquefaction potential means that there is a 50% probability of having an earthquake within a 100-year period that will be strong enough to cause liquefaction. When the ground liquefies, it may lose its ability to support buildings and other structures. Portions of the Mission, the Castro, and the Haight among areas of high risk during next major shakerNo place in the Bay Area is safe when it comes to the inevitable earthquakes that loom on the horizon. But some neighborhoods are better situated than others.The California Geological Survey (CGS) updated its CGS defines a major earthquake as measuring 5.5 or greater on the Richter scale. Detailed information can be found in the map or report. Figure on the right (USGS photo) shows part of the Cypress structure, the freeway approach to the Bay Bridge from Oakland, which collapsed during the Loma Prieta earthquake, killing 42 people. 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. The California Geological Survey’s Earthquake Hazards Zone Application (EQ Zapp) is an interactive map that details the risk of earthquakes and related hazards for different areas of the state.

The maps can also be used by local officials and public policy makers for land-use planning and emergency response planning. Special Study Areas Map Salt Lake County, UT Salt Lake County Planning and Development Services 2001 S State St Ste N3600 SLC, UT 82190-4050 For more information call: (801) 468-2441 DISCLAIMER: Legend Freeway Faults Canals Streams JordanRiver Study Area Lakes Municipal Boundaries Liquefaction …

It is important to map these deposits because so much of our infrastructure resides on them, and because they may host liquefaction, the phenomenon of saturated soils losing their stiffness and strength during shaking. You have unsaved data that will be lost if you leave this page. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay.

Landslide-prone areas are … 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.

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