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The intent of the Alquist-Priolo Act is to prohibit the location of developments and structures for human occupancy across the trace of active fault, thus avoiding the hazard of surface fault rupture.

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Earthquake Fault Zones encompass hazardous faults, which are defined as those faults that are sufficiently active and well-defined:

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       *  Sufficiently active - faults that exhibit evidence of Holocene displacement

         (approximately last 11,000 years)

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       *  Well-defined - trace detectable by trained geologist

NOAA Natural Hazards Image Database

1906 San Fransisco Earthquake. M = 8.2

1979 El Centro Earthquake. M = 6.9

1971 San Fernando Earthquake. M = 6.6

NOAA Natural Hazards Image Database

Youd, T.L & Olsen H.W  in Geological Survey Professional Paper 733

ALQUIST-PRIOLO EARTHQUAKE FAULT ZONING ACT

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