Alquist priolo earthquake fault zone

New Alquist-Priolo Earthquake Fault Zone Maps

alquist priolo earthquake fault zone

Alquist-Priolo earthquake fault zones are regulatory zones surrounding the surface traces of active faults in California. (A trace is a line on the earth's surface .

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In , the magnitude 6. Much of the damage was due to the failure of buildings that had been built directly above the fault lines that ruptured during the earthquake. According to the California Geological Survey, the AP Act requires the State Geologist to establish regulatory zones, known as earthquake fault zones, around the surface traces of active faults and to issue appropriate maps. These maps are distributed to all affected cities, counties, and state agencies for their use in planning and controlling new development. Single-family wood-frame and steel-frame dwellings up to two stories that are not part of a development of four units or more are exempt. However, local agencies, such as cities, counties, school districts, and others, can impose more restrictive regulations. The intent of the Alquist-Priolo Act is to prohibit the location of developments and structures for human occupancy across the trace of active faults, thus avoiding the hazard of surface fault rupture.

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Its purpose is to prevent the construction of new buildings across known active faults. Building in an active fault zone requires a geology report. Ideally the report includes the fault's location, whether the fault is active or not and building setbacks where needed. Often faults are difficult to find. Deep young alluvium prevents trenches from reaching ruptured soils making determining a fault's location and activity difficult. This case study illustrates how we used high resolution seismic refraction to overcome this problem and locate a fault.

The Whittier Fault is a major structural element in the eastern Los Angeles basin. It is the longer of two northern extensions of the active Elsinore Fault Zone, the other being the Chino Fault. Primary sense of movement along this complex fault zone is right-lateral strike-slip, trending about N70 o W, with dips ranging from 65 to 80 o NE. Detailed paleoseismic studies have revealed complex fault characteristics at the Olinda Oil Field and Olinda Ranch sites. Gath et al. The central and southern strands form a positive flower structure: southern strand dipping northeast, central strand dipping southwest, with an elevated pressure ridge between the two faults.

Alquist Priolo Special Studies Zone Act

Earthquake Fault, Mammoth Mountain, California




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