Today, the Bay Area population has increased ten-fold to 7 million people, all at risk from expected earthquakes on one or more of the Bay Area faults.
The most active faults in the region are the San Andreas Fault and the Hayward Fault. San Francisco is exposed to seismic hazards from numerous known faults and potentially unmapped or undiscovered faults. In this USGS liquefaction susceptibility map of San Francisco, areas of very high risk are marked in red, high risk in orange, moderate risk in yellow, low risk in green and very low risk are white. The Seismic Hazards Mapping Act (Act) of 1990 (Public Resources Code, Chapter 7.8, Section 2690-2699.6) directs the Department of Conservation to identify and map areas prone to earthquake hazards of liquefaction, earthquake-induced landslides and amplified ground shaking. San Francisco, 1951 These soil types are recognized in many local building codes. Subsurface conditions can vary abruptly and borings are required to estimate amplification at a given location. Subsurface conditions can vary abruptly and borings are required to address the hazard at a given location. The base closed in 1997, but development has been stymied by toxic contamination, a high risk of liquefaction during an earthquake, and political wrangling. Liquefaction is a phenomenon that is caused by earthquake shaking. Records from many earthquakes show that ground conditions immediately beneath a structure affect how hard the structure shakes. In 2000, the City's Department of Building Inspection (DBI) initiated a program, known as the Community Action Plan for Seismic Safety (CAPSS), with the mission to develop and implement a work plan for reducing earthquake risks in San Francisco, and to improve post-earthquake response policy. High quality printable image.This map shows the capability of the ground to amplify earthquake shaking in the communities of Alameda, Berkeley, Emeryville, Oakland and Piedmont. The purpose of the Act is to reduce the threat to public safety and to minimize the loss of life and property by identifying and mitigating these seismic hazards. At the time of the earthquake, much of the Bay Area was sparsely populated; San Jose was a small town of 25,000. Twenty two of these earthquakes measured 5.0 or greater.Copyright © 2014, Earthquake Safety, Inc. All Rights Reserved. The Act requires site-specific geotechnical investigations be conducted identifying the hazard and formulating mitigation measures prior to permitting most developments designed for human occupancy within the Zones of Required Investigation.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. These include the Hayward Fault running through East Bay communities, the San Andreas Fault running from below San Jose through San Mateo and San Francisco Counties and extending into Marin County, the San Gregario Fault cutting across Western San Mateo County, and the Concord and Calavaras Faults in Contra Costa and Eastern Alameda County areas.The map also shows earthquakes of magnitudes between 1.5 and 7.0 occurring in these areas between 1970 and 2003. Each color represents a 10% probability of a certain MMI being exceeded in 50 years. Cities and counties are then required to use the Seismic Hazard Zone maps in their land use planning and building permit processes. The San Franciscan government, it's residents, and it's seismic experts are always searching for ways to mitigate earthquake damage, increase preparedness, They integrate and interpret these data regionally in order to evaluate the severity of seismic hazards and designate Zones of Required Investigation for areas prone to liquefaction and earthquake-induced landslides. San Francisco County Hazard Map View Legend Use this map to view the intensity of shaking likely across the county from all faults in a given time period. The map depicts the hazard at a regional scale and should not be used for site-specific design and consideration.
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