Seismic Hazards Mapping Act

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The Seismic Hazard Mapping Act ("The Act") was enacted by the California legislature in 1990 following the Loma Prieta earthquake of 1989. The Act requires the California State Geologist to create maps delineating zones where data suggest amplified ground shaking, liquefaction, or earthquake-induced landsliding may occur ("seismic hazard zones").

The Act requires responsible agencies to approve only projects within seismic hazard zones following a site-specific investigation to determine if the hazard is present and inclusion of appropriate mitigation(s) if so. The Act also requires disclosure by real estate sellers and agents at the time of sale if a property is within one of the designated seismic hazard zones.

The Act called for the creation of an advisory board to the State Mining and Geology Board to advise on the Act's implementation. In a 2004 update to the seismic hazard zone mapping guidelines, this advisory body concluded the amplified ground motion hazard was already sufficiently addressed by the 2001 California Building Code. Consequently, zones for this hazard are not being mapped by the State Geologist.


Evaluation of the geotechnical report by leadership agency that identifies the location of the map received by the county .[1] The California State Geologist identified "seismic hazard areas" which have been mapped identifying potential seismic dangers .[2] The Act requires responsible agencies to approve only projects within seismic hazard areas after a site-specific inquiry to whether danger occurs and inclusiveness of suitable mitigations if so .[citation needed] In the last few years , scientists have developed ways in identifying and map these zones of high seismic hazard .[3] The Act requires site-specific geotechnical investigations be conducted identifying danger and formulating mitigation steps before to permitting most developments designed for human occupancy within the areas of Required Investigation .[4] Staff geologists in the Seismic Hazard cartography Program gather existing geological , geophysical and geotechnical data from many sources to compile the Seismic Hazard Zone Maps . Seismic hazard cards further legislation reducing earthquake losses : This card sequence illustrates the shaking hazard in San Francisco for a potential repetition of the great 1906 earthquake . The likelihood that the seismic hazard would threaten public health and security in case of earthquakes .[5] In 1990 the California State Legislature passed the Seismic dangers cartography law to safeguard public security from implications of strong ground shaking , liquefaction , landslides , or other ground failure , and other risks caused by earthquakes . The State Geologist shall compile cards identifying seismic hazard areas , coherent with demands of article 2695 . The geotechnical report shall be ready by a recorded civil engineer or certified genius geologist , having competence in the area of seismic hazard assessment and mitigating .

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