Hosgri Fault

The Hosgri Fault (also Hosgri Fault Zone, San Gregorio-Hosgri Fault Zone) is an offshore fault zone located near the Central Coast of California in San Luis Obispo County. The main fault stretches for about 140-kilometre (87 mi), and the coastal communities closest to it are Cambria, San Simeon and Morro Bay, Baywood Park-Los Osos, and Avila Beach.^[1] The fault system (including branches) is some 420 km long, and is a right-lateral strand of the San Andreas fault system.^[2]

Characteristics

The Hosgri Fault is a component of the San Andreas Fault system.^[3] Its movement is primarily reverse thrust, as well as exhibiting right lateral slip, and is thought to be capable of generating earthquakes of up to magnitude 7.5.^[1] The November 4, 1927 Lompoc earthquake (magnitude 7.1) is thought to have occurred (uncertainty) on this fault.^[4]

Diablo Canyon Power Plant

Seismologists monitor activity on the Hosgri fault constantly because of its physical proximity to the nuclear Diablo Canyon Power Plant. In fact, the fault lies only 2½ miles offshore from the nuclear power plant.^[5] More recently in 2008, yet another even closer fault was discovered, the Shoreline Fault 1 mile from the NPP.

Coordinates: 35°07′N 119°39′W / 35.117°N 119.650°W / 35.117; -119.650

References

1 2 "Hosgri Fault Zone" Southern California Earthquake Data Center. Southern California Earthquake Data Center, n.d. Web. 12 Oct. 2009.
↑ Geological Society of America:STRUCTURAL ANALYSIS OF THE SAN SIMEON FAULT ZONE, CALIFORNIA: IMPLICATIONS FOR TRANSFORM TECTONICS
↑ Graham, S. A., and W. R. Dickinson. "Evidence for 115 Kilometers of Right Slip on the San Gregorio-Hosgri Fault Trend." Science 199.4325 (1978): 179-181. Print.
↑ SCEDC|Lompoc Earthquake (1927) Southern California Earthquake Data Center
↑ Smith, R. Jeffrey (1981), "A Seismological Shoot-Out at Diablo Canyon" (PDF), Science, American Association for the Advancement of Science, 214 (4520): 528–529, doi:10.1126/science.214.4520.528

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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