A Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete. 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. DataSF's mission is to empower use of data. In the South Bay and along the Peninsula, one massive liquefaction zone extends from SFO down through most of Santa Clara and San Jose. The maps and accompanying app can also be used to determine which potential quake hazards must be disclosed when attempting to sell property in California.CGS notes that due to limitations in data availability and mapping at regional scales, “it is expected that some of these hazards will produce damaging ground failures outside the delineated zones in future earthquakes.”But the agency adds that “the majority of occurrences will be within the zoned areas.”Earthquakes of 5.5 or greater are relatively common (in geologic terms) along Bay Area faults, but may become more or less frequent depending on other recent eruptions.Cycles of seismicity and quiescence were associated with the Bay area earthquakes of 1868, 1906, and 1989.
Feature Info . The liquefaction potential categories shown on this map depend on the probability of having an earthquake within a 100-year period that will be strong enough to cause liquefaction in those zones.
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.
Earthquake map reveals liquefaction risks in Bay Area neighborhoods
Borehole Database Explorer (web application) EQ Zapp: California Earthquake Hazards Zone Application (web application) - This is one of our most popular map products. ZONE: Internal attribute SUSCEPTIBILITY: Generalized description of liquefaction susceptibility The Oregon Department of Geology and Mineral Industries (DOGAMI) has produced a series of earthquake hazard maps including liquifaction 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.
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 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. Base map. Find out if your property is in an Alquist-Priolo Earthquake Fault Zone or Seismic Hazard Zone, or both. West Oakland and most of Emeryville also face liquefaction risks, as does the western flank of Berkeley.
Three types of geological hazards, referred to as seismic hazard zones, may be featured on the map: 1) liquefaction, 2) earthquake-induced landslides, and 3) overlapping liquefaction and earthquake-induced landslides. Three types of geological hazards, referred to as seismic hazard zones, may be featured on the map: 1) liquefaction, 2) earthquake-induced landslides, and 3) overlapping liquefaction and earthquake-induced landslides. 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). 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
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This page contains a collection of these resources and a brief description of each item. The liquefaction zones shown in dark green are well-known — landfill areas including the Marina, Fisherman's Wharf, Dogpatch and South of Market. The older map also shows locations of liquefaction observed in historical earthquakes, particularly the Great 1906 earthquakeand the 1989 Loma Prieta quake.
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