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 87 miles (140 km), and is located nearest to the coastal communities of Cambria, San Simeon, Morro Bay, Baywood Park-Los Osos and Avila Beach.[1] The fault system (including its branches) is some 260 mi (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 2+1⁄2 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.

35°07′N 119°39′W

References

"Hosgri Fault Zone" Archived 2009-12-11 at the Wayback Machine Southern California Earthquake Data Center. Southern California Earthquake Data Center, n.d. Web. 12 Oct. 2009.
"Structural analysis of the San Simeon Fault Zone, California:Implications for transform tectonics". Geological Society of America. Archived from the original on 2016-03-14. Retrieved 2011-02-23.
Graham, S. A.; Dickinson, W. R. (1978). "Evidence for 115 Kilometers of Right Slip on the San Gregorio-Hosgri Fault Trend". Science. 199 (4325): 179–181. Bibcode:1978Sci...199..179G. doi:10.1126/science.199.4325.179. PMID 17812950. S2CID 23869449.
SCEDC|Lompoc Earthquake (1927) Archived 2011-06-06 at the Wayback Machine Southern California Earthquake Data Center
Smith, R. Jeffrey (1981), "A Seismological Shoot-Out at Diablo Canyon" (PDF), Science, 214 (4520): 528–529, Bibcode:1981Sci...214..528S, doi:10.1126/science.214.4520.528, PMID 17838395

Seismically active fault zones and tectonic blocks of California
Statewide Faults	San Andreas Fault Salinian Block
Southern California	Brawley Seismic Zone Chino Fault Elsinore Fault Zone Elysian Park Fault Garlock Fault Hollywood fault Hosgri Fault Imperial Fault Zone Laguna Salada Fault Newport–Inglewood Fault Northridge Blind Thrust Fault Peninsular Ranges Puente Hills Fault Raymond Fault Rose Canyon Fault Salton Trough San Cayetano Fault San Diego Trough Fault Zone San Felipe Fault Zone San Gabriel Fault San Jacinto Fault Zone Santa Maria River Fault Santa Ynez Fault Shoreline Fault Sierra Madre Fault Zone Ventura Fault White Wolf Fault Whittier Fault Yorba Linda Fault
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 Nacimiento Fault Pleasanton Fault Rinconada Fault San Gregorio Fault San Pablo Fault Seal Cove Fault Serra Fault Silver Creek Fault Tesla Fault West Napa Fault
Sierra Nevada	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)

Hosgri Fault

Characteristics

Diablo Canyon Power Plant

References

Further reading