Seismic Hazards Mapping Act

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.

Background

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 . 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 .

External links

Law.justia.com: Seismic Hazards Mapping Act

Seismically active fault zones and tectonic blocks of California

Statewide Faults	San Andreas Fault

Faults, zones, and blocks of Southern California	Brawley Seismic Zone Chino Fault Elsinore Fault Zone Elysian Park Fault Garlock Fault Hosgri Fault Imperial Fault Zone Laguna Salada Fault Newport–Inglewood Fault Peninsular Ranges Puente Hills Fault Raymond Fault Rose Canyon Fault Salton Trough Salinian Block San Cayetano Fault San Felipe Fault Zone San Gabriel Fault San Jacinto Fault Zone Santa Maria River Fault Santa Ynez Fault Shoreline Fault Ventura Fault White Wolf Fault Whittier Fault Yorba Linda Fault

Faults and zones of Northern California	Bartlett Springs Fault Calaveras Fault Clayton-Marsh Creek-Greenville Fault Concord Fault Hayward Fault Zone Healdsburg Fault Maacama Fault Mendocino Fracture Zone Mendocino Triple Junction Mount Diablo Thrust Fault Monta Vista Fault Pleasanton Fault San Gregorio Fault San Pablo Fault Seal Cove Fault Serra Fault Silver Creek Fault Tesla Fault West Napa Fault

Sierra Nevada faults, zones, and blocks	Death Valley Fault Zone Furnace Creek Fault Zone Honey Lake Fault Zone Kern Canyon Fault Maria fold and thrust belt Owens Valley Fault Rescue Lineament-Bear Mountains fault zone Sierra Nevada Batholith Sierra Nevada Fault Sierra Nevada-Great Valley Block Smartville Block Walker Lane

Category California Geological Survey Seismic Hazards Mapping Act Mexico (list)

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