The California Geological Survey produces State-mandated regulatory maps that show “ Zones of Required Investigation ” for liquefaction (and landslide) hazard. Please use the older map for areas not covered by the new map. Our methodology emphasizes layer-based interpretation of detailed Quaternary mapping, calibrated by quantitative evaluation of borehole data, as the basis for delineating liquefaction susceptibility (e.g.
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. 1, February 2008, pp. The work was based on terrain mapping completed in general accordance with Howes and Kenk (1997). evaluation of future development decisions), and for emergency response planning.Our mapping encompasses the communities of Ventura and Oxnard on the Oxnard Plain, communities within the Santa Clara River Valley, and other populated valleys in Ventura County (Figure 1). 1–16 3
When the ground liquefies, it may lose its ability to support buildings and other structures. Digital Quaternary geologic maps, shallow groundwater contour maps, and liquefaction hazard maps, were constructed at a scale of 1:12,000 for all alluviated areas within Ventura County, California. Our step-by-step GIS approach for mapping hazards from ground failure caused by liquefaction during large earthquakes emphasizes integration of original digital geologic mapping with numerous sets of base data and subsurface data. These properties include sediment grain-size distribution, density, cementation, saturation, and depth. 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. We have developed maps of Quaternary deposits and liquefaction susceptibility for Ventura County in southern California (Figure 1). These ground motions typically are produced by large-magnitude earthquakes, exceeding magnitude (Mw) 6.5. 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. Major fault zones capable of producing large earthquakes in or near the study area include the Oak Ridge fault, the Simi-Santa Rosa fault system, the Santa Ynez fault, the Red Mountain fault, the Santa Susana fault, and the San Andreas fault. Hazard maps showing the distribution of liquefiable sediments, termed liquefaction susceptibility maps by Youd and Perkins (1978), currently are the main tool used for evaluation of regional liquefaction hazard. Liquefaction is a phenomenon that is caused by earthquake shaking. V, No. Earthquake Zones of Required Investigation: Maps showing faults, fault traces, liquefaction zones and earthquake … Soft muds shake much harder than bedrock. Planners and emergency response personnel with non-technical backgrounds need real world maps that depict likely consequences of liquefaction.
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