Soft muds on which it was constructed shook much more strongly than surrounding regions on stronger ground.
The map is color-coded to show areas of very high (red), high (orange), moderate (yellow), low (green) and very low (white) susceptibility to liquefaction. This data set of polygon features represents Riverside County's liquefaction zones.
The maps are mainly based on the underlying geology (for example, rock, old river gravels, relatively young estuary silts) and on borehole and groundwater information (depth to the water table). Subsurface conditions can vary abruptly and borings are required to address the hazard at a given location. 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. Liquefaction risk is related to the type of soils present. An understanding of the conditions that cause liquefaction enables geologists to produce maps of liquefaction susceptibility. Traced from a PDF file; please let me know about any errors. 1 of 16.
If the current water table is deeper, the probability of liquefaction is reduced. A Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete.
Such areas along the Bay margins are found in San Francisco, Oakland and Alameda Island, as well as other places around San Francisco Bay. Traced from a PDF file; please let me know about any errors. 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. ZONE: Internal attribute SUSCEPTIBILITY: Generalized description of liquefaction susceptibility 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. Liquefaction occurs when vibrations or water pressure within a mass of soil cause the soil particles to lose contact with one another. approximate probability that shallow wet sands will liquefy and cause surface manifestations of liquefaction such as sand boils and ground cracking. Please use the older map for areas not covered by the new map. A Northern San Francisco and the Marin peninsula are not included in the new maps because geologic field mapping in these regions is incomplete. 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. Environment Canterbury has commissioned several liquefaction reports and maps for Canterbury since 2000. This map shows the likelihood of liquefaction in Northern Santa Clara County during a magnitude 6.9 earthquake on the northern and central segments of the Calaveras Fault shown on the location map. 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.
Liquefaction is a phenomenon that is caused by earthquake shaking. Wet sand can become liquid-like when strongly shaken. An understanding of the conditions that cause liquefaction enables geologists to produce maps of liquefaction susceptibility. This data is based on exisitng geological maps published by GNS and similar investigations. The California Geological Survey (CGS) updated its seismic hazard zone map in April, revealing the most dangerous places in the Bay Area during phenomena like liquefaction … 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). No data point selected. 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. The liquefied sand may flow and the ground may move and crack, causing damage to surface structures and underground utilities.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 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.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.
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