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Here's a map of the significant fault lines and strong earthquakes in the Bay Area. Here, thanks to the USGS, is the relevant part of a detailed geological map of the area. Advanced embedding details, examples, and help! The right‐lateral San Gregorio‐Hosgri fault system (SGHF) extends mainly offshore for about 400 km along the central California coast and is a major structure in the distributed transform margin of western North America. Archived report (descriptions no longer maintained) San Gregorio fault zone, San Gregorio section (Class A) No. The San Andreas fault system is to the west, the Garlock fault is to the south and the faults of the Sierra Nevada are to the east. San Gregorio-Hosgri fault zone, California Item Preview remove-circle Share or Embed This Item. Magnitude 7.5 Earthquake on the San Gregorio Fault Scenario ShakeMap ShakeMap created by SCEC UseIT 2014 Interns for the Earthquake Country Alliance using the OpenSHA platform. movement on San Gregorio Fault The San Andreas Fault, considered a long transform fault, passes to the east of Monterey Bay in west-central California, USA. Map showing the San Gregorio fault zone and other major Holocene faults in the western San Francisco Bay area. The San Andreas Fault system and its major branch faults are about 40 miles wide in the Bay area and extends from the San Gregorio Fault near the coastline to the Coast Ranges-Central Valley blind thrust at the western edge of the Great Central Valley as shown on the Regional Fault Map, Figure 3. This is the Santa Cruz coastline and you have seen this area in past labs. The Instrumental Intensity map is based on a combined regression of recorded peak acceleration and velocity amplitudes. The Santa Cruz Mountains lie between the San Andreas Fault Zone and the San Gregorio Fault system. Geo Lab - San Gregorio Fault (GC2YTK1) was created by Raramuri on 6/23/2011. 2 Fig. The Hayward Fault is one of the secondary faults in this diffuse zone, along with the Calaveras Fault to the east and the San Gregorio Fault, west of the San Andreas. This is the Santa Cruz coastline and you have seen this area in past labs. on 3 sheets 110 x 87 cm. Seismic profiling and earthquake epicenters have shown the approximate location of the fault zone across Monterey Bay (Fig. It's a Not chosen size geocache, with difficulty of 1.5, terrain of 1.5. North of the Golden Gate, dextral slip from the San Gregorio fault zone [60] may be transferred to the North Coast section [1b] along a right-releasing step. EMBED. The known faults in the San Francisco area include the San Andreas, the Hayward, the Rodgers Creek and the San Gregorio. It's located in California, United States.Along the Big Sur coastline, just an easy walk from the highway, lies an easily accessible fault to explore! 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. The study area is included between the Ben Lomond and the San Gregorio fault zones. Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. Most of the San Gregorio fault trace is located offshore beneath the waters of Monterey Bay, Half Moon Bay, and the Pacific Ocean, though it cuts across land near Point Año Nuevo and Pillar Point. Below is a geologic map pointing out the distribution of the Purisima Formation (in light beige color) and the major tectonic feature of this area -- the San Gregorio Fault, which is a fault associated with the San Andreas Fault System. 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. • San Gregorio fault: The San Gregorio fault runs west of the San Andreas, roughly off the coast of the Bay Area and along seashore areas of Marin and San … As of January 12, 2017, the USGS maintains a limited number of metadata fields that characterize the Quaternary faults and folds of the United States. The Monterey Bay lies between the San Andreas Fault to the east and the San Gregorio Fault to the west. The MBNMS is located along the active transform boundary (the San Andreas fault system) separating the Pacific Plate from the North American Plate. But communities like Desert Hot Springs, San Bernardino, Wrightwood, Palmdale, Gorman, Frazier Park, Daly City, Point Reyes Station and Bodega Bay lie squarely on the fault and are sitting ducks. Map of Quaternary faulting along the San Gregorio fault zone, San Mateo and Santa Cruz counties, California: Series title: Open-File Report: Series number: 80-907: DOI: 10.3133/ofr80907: Edition-Year Published: 1980: Language: ENGLISH: Description: 2 maps ;49 x 40 cm. The San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. a) Sketch map of California including the location of the study area (red box) and the main tectonic structures represented by the San Andreas Fault Zone (SAFZ) and the San Gregorio Fault Zone (SGFZ). The San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. Both communities are situated inland of state beaches that share their names. No_Favorite. And despite San Francisco’s legendary 1906 earthquake, the San Andreas Fault does not go through the city. The San Francisco Bay Area also suffers from the unfortunate confluence of large populations and active faults. The San Andreas fault system is the major geologic boundary between the North American and Pacific tectonic plates and passes through much of the state. EMBED (for wordpress.com hosted blogs and archive.org item tags) Want more? Neotectonics of the Big Sur Bend, San Gregorio‐Hosgri fault system, central California. ... San Gregorio Fault (SGF) Southern San Gregorio (SGS) 7.0. The most significant faults within the plate boundary in central and northern California include the San Andreas, San Gregorio-Hosgri, and Hayward-Rodgers Creek fault zones. 1. Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. the zone, but the zone as a whole reflects deformation derived from oblique right-lateral and The San Andreas Fault and 6 other significant fault zones are present in the Bay Area: the Calaveras, Concord-Green Valley, Greenville, Hayward, Rodgers Creek, and San Gregorio Faults. Measurements of so … Modified from Jennings (1994), segment boundaries (rectangles) along the San Andreas fault after WGCEe (1990). b) Schematic structural map. This section of the San Andreas fault ruptured in the 1906 M~7.9 San Francisco earthquake, with similar events thought to have a recurrence interval of about 250 years. The Hayward Fault is one of the secondary faults in this diffuse zone, along with the Calaveras Fault to the east and the San Gregorio Fault, west of the San Andreas. Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). 3). The San For the most up-to-date information, please refer to the interactive fault map. This map makes it easier to relate the recorded ground motions to the expected felt and damage distribution. or smaller. Each of these fault zones has important offshore sections that, until recently, were not mapped in great detail. Generalized geologic map of the northern on-land portion of the San Gregorio fault, showing the study area and both the previously mapped and the revised fault locations. ... Hayward, Mt. The nearest significant onshore cultural centers in the map area are San Gregorio and Pescadero, both unincorporated communities with populations well under 1,000. Here the fault system is over 100 km wide and incorporates faults in the offshore, including those of the Palo Colorado-San Gregorio and Monterey Bay fault zones . However, it is actually a wide fault zone with several different smaller faults from the San Gregorio fault offshore of Monterey Bay in the west to western Nevada in the east (figure 1). Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). Fault (geology) Northern California Monterey Bay San Francisco Bolinas Bay The complete fault zone, including the Rodgers Creek fault, is divided by seismologists into three segments – Rodgers Creek, Northern Hayward, and Southern Hayward. and 175 x 112 cm. 60a Introduction [2] Four major strike‐slip fault zones cross through the San Francisco Bay region, which accommodate most of the ∼39 mm/yr of relative plate motion between the Pacific plate and the Sierra Nevada range. However, the nine counties of the Bay Area are home to dozens of major faults — the San Andreas, the Calaveras, the Concord-Green Valley, the San Gregorio, the Rodgers Creek and the Hayward, chief among them. Western San Francisco Bay area velocity amplitudes on a combined regression of recorded acceleration. And the San Andreas fault does not go through the city populations well under 1,000 Napa. Both communities are situated inland of state beaches that share their names segment! 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