The village of San Gregorio is 12.11 kilometers from the town of L'Aquila, of which it is considered a suburb community (Fraction or Frazione). Here, thanks to the USGS, is the relevant part of a detailed geological map of the area. Italy's SS17 Highway is its main transportation artery. An additional consequence of the fault geometry is that the San Andreas fault is expected to have migrated eastward relative to the San Gregorio fault. West of the San Andreas fault, the 400-kilometer-long San Gregorio-Hosgri fault extends primarily offshore between Point Conception and Bolinas, and sits within 3 nautical miles (in state waters) of the Diablo Canyon Power Plant. Just offshore from Lake Merced, the inferred fault trace steps right (northeast) 3 km onto a nearly parallel strand that can be traced magnetically northwest more than 20 km as the linear northeast edge of a magnetic block bounded by the San Andreas fault, the Pilarcitos fault, and the San Gregorio-Hosgri fault zone. 1b,c), but not its exact sea-floor trace.Zones of high acoustic backscatter from side-looking sonar are noted near the San Gregorio fault zone and they are thought to represent a surficial expression of the fault zone on the shelf (Fig. An additional consequence of the fault geometry is that the San Andreas fault is expected to have migrated eastward relative to the San Gregorio fault. Sacramento : California Division of Mines and Geology, 1978 If so, right slip on the San Andreas and San Gregorio-Hosgri faults accounts for most of the movement between the Pacific and North American plates since mid-Miocene time. It cuts the Miocene Purisima Formation at the surface, juxtaposing moderately lithified sandstone and conglomerate interbeds in the hanging wall with mudstones in the footwall. Learn how to create your own. The San Andreas Fault sits at 22 percent, with the Concord Fault at 16 percent, and the San Gregorio Fault at six percent. The San Gregorio fault, the boundary between the Pacific Plate, to the west, and the western San Andreas Fault zone, passes through Monterey Submarine Canyon at about 1,800 m below sea level.17The fault is delineated by earthquake epicenters and small topographical features within Monterey Canyon. Kimberly Blisniuk, Ph.D., geologist, geochronologist and San José State University associate professor of geology, is similarly collecting slip rate data from sites on Northern and Southern California sections of the San Andreas Fault, the San Gregorio Fault near Half Moon Bay and Mavericks and the Rogers Creek Fault in Sonoma County. The village sits near an active earthquake fault zone in the Valley of the Aterno-Pescara. The triple-junction at the northern end of the San Andreas Fault Zone passed through this region about 8-10 Million years ago (Anderson and Menking, 1994), and pairs of feature along the fault suggest around 115 km or right lateral displacement along the San Gregorio FZ alone (Graham and Dickinson, 1978), Holocene motion along the SGF has been documented, and slip rates are estimated at 0-12mm/yr. We thus propose a model of eastward stepping right-lateral fault formation to explain the observed multiple fault strands and depositional basins. Measurements of so … Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. Each of these fault zones has important offshore sections that, until recently, were not mapped in great detail. These features are some of the most prominent ways geologic processes shape the surface of the Earth. Includes bibliographies Notes. is an active, large-offset, dominantly strike-slip fault which is exceptionally well exposed. 2 Fig. Additional Physical Format: Online version: San Gregorio-Hosgri fault zone, California. The estimates from the two models generally agree with one another and to a lesser extent with the geologic estimate. Credit: Kate Borton, David Howell, and Joe Vigil. Faults are flat fracture surfaces within rock where portions of the rock move past each other. of slip on the San Andreas‐San Gregorio fault system, elongated extensional basins are predicted to form between the two faults. Here's a map of the significant fault lines and strong earthquakes in the Bay Area. 1c). The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the Paleoseismological investigationsThe recent activity of the San Gregorio fault segment was investigated by digging two excavations across the tectonic structure, one across "Valle degli Asini" (trench 1) and one in the northern portion of the fault (trench 2), across the bedrock fault scarp along which ground cracks occurred after the 2009 earthquake (Fig. The San Gregorio—Hosgri fault trend is a component of the San Andreas fault system on which there may have been about 115 kilometers of post-early Miocene right-lateral strike slip. This map was created by a user. Over the course of 2–3 m.y. “We know the San Andreas Fault is an active fault and it's going to continue to produce larger earthquakes that are going to impact large sections of Southern California and Central California. The well-known San Andreas Fault, which Schwartz calls the "master fault," is accompanied by the San Gregorio Fault, the Hayward Fault, the Calaveras Fault and the Rodgers Creek Fault … EMBED. San Gregorio, Californie, in San Mateo Coonty San Gregorio Fault, an yirdquauk fault associatit wi the San Andreas fault affshore o San Mateo an mair soothren coonties; San Gregorio nude beach; San Gregorio State Beach; San Gregorio Creek; San Gregorio Reservoir, Rio Arriba Coonty, New Mexico; Elsewhaur . The San Gregorio fault cuts right across Half Moon Bay, across the promontory where the airport is located, and then heads out to sea again to the northwest. The faults shown here are represented by simple lines which do not show how deep and large they are. A westward bend in the San Andreas Fault Zone, southeast of the map area, coupled with right-lateral movement along the San Gregorio Fault system have caused regional folding and uplift. Seismic profiling and earthquake epicenters have shown the approximate location of the fault zone across Monterey Bay (Fig. Calaveras, Rodgers Creek, Green Valley and Greenville faults) in the San Andreas fault system in the San Francisco Bay area. The Monterey Bay-Tularcitos faults, and many other area fault zones are both in the bay and on land: San Gregorio fault zone, Cypress Point fault, Reliz fault zone, San Andreas fault zone, Zayante-Vergeles fault zone, and Butano fault. Zapucay and Argentinita deposits lie along the extension of the one fold and thrust fault system to the east, with similar age of SGFS. Image: San Andreas Fault. Some significant faults in the region are the Calaveras, Concord-Green Valley, Greenville, Hayward, Mt. The known faults in the San Francisco area include the San Andreas, the Hayward, the Rodgers Creek and the San Gregorio. The West Coast science hub of Monterey Bay is located in a seismic hazard zone, where the San Gregorio and San Andreas fault systems connect. Even in … The San Francisco Bay Area is criss-crossed by a series of major faults that together relieve the motion and grinding between the huge Pacific and North American plates. The coastal area consists of high coastal bluffs and vertical sea cliffs. San Gregorio-Hosgri fault zone, California by Silver, Eli A; Normark, William R. Publication date 1978 Publisher Sacramento : California Division of Mines and Geology Collection caminesgeo; ucdavis; americana Digitizing sponsor University of California, Davis Libraries Contributor University of California, Davis Libraries Language English Volume No.137. The complete fault zone, including the Rodgers Creek fault, is divided by seismologists into three segments – Rodgers Creek, Northern Hayward, and Southern Hayward. Introduction The San Gregorio fault zone is the principal tectonic structure west of the San Andreas fault in the coastal region of central California between Monterey Bay and Bolinas La- goon. The fault is located primarily offshore, with strands intersecting the coastline at only two locations: between Pt. The deposits located along the east-west to northwest trending SGFS are, from west to east, the Santa Teresa deposits, the Polvorín deposit, the Ombú deposit, the San Gregorio deposit and the Arenal deposit. 3). The Seal Cove Strand of the San Gregorio Fault at Moss Beach, Ca.