In the South Bay and along the Peninsula, one massive liquefaction zone extends from SFO down through most of Santa Clara and San Jose. 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.
All of the following resources can also be found on our Publications and Maps page, through the The maps aid the design professional by delineating areas where liquefaction could pose a significant hazard and should therefore be considered during facilities design. You may Save your changes to view them, or Cancel to stay on this page.This change requires a reload. Measure distances. Earthquake Faults, Shaking, Landsliding, and Liquefaction.
Data. ZONE: Internal attribute SUSCEPTIBILITY: Generalized description of liquefaction susceptibility A Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete. title.
Soft muds shake much harder than bedrock. Coordinate. Developers of properties falling within any of the three zones may be required to investigate the potential hazard and mitigate its threat during the local permitting process.This is a digital Seismic Hazard Zone Map presenting areas where liquefaction and landslides may occur during a strong earthquake. 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. Address. Feature Info .
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.
You have unsaved data that will be lost if you leave this page. Please use the older map for areas not covered by the new map. Landslide-prone areas are … 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. A Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete. 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. 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. Borehole Database Explorer (web application) EQ Zapp: California Earthquake Hazards Zone Application (web application) - This is one of our most popular map products. 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. SeattleLiquefaction1. 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. Launch Streetview. Please use the older map for areas not covered by the new map. This page contains a collection of these resources and a brief description of each item.
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. We believe use of data and evidence can improve our operations and the services we provide. Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. When the ground liquefies, it may lose its ability to support buildings and other structures. 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.
Earthquake map reveals liquefaction risks in Bay Area neighborhoods Seattle Liquefaction Color intensity indicates danger from earthquakes.
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 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. 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.
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