Here, thanks to the USGS, is the relevant part of a detailed geological map of the area. 1. Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. The nearest significant onshore cultural centers in the map area are San Gregorio and Pescadero, both unincorporated communities with populations well under 1,000. 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. on 3 sheets 110 x 87 cm. The Santa Cruz Mountains lie between the San Andreas Fault Zone and the San Gregorio Fault system. The study area is included between the Ben Lomond and the San Gregorio fault zones. 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. 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! Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. It's a Not chosen size geocache, with difficulty of 1.5, terrain of 1.5. ... San Gregorio Fault (SGF) Southern San Gregorio (SGS) 7.0. The Monterey Bay lies between the San Andreas Fault to the east and the San Gregorio Fault to the west. This map makes it easier to relate the recorded ground motions to the expected felt and damage distribution. 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. No_Favorite. Modified from Jennings (1994), segment boundaries (rectangles) along the San Andreas fault after WGCEe (1990). The San 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. Geo Lab - San Gregorio Fault (GC2YTK1) was created by Raramuri on 6/23/2011. 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. 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 MBNMS is located along the active transform boundary (the San Andreas fault system) separating the Pacific Plate from the North American Plate. 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. 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. 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. Fault (geology) Northern California Monterey Bay San Francisco Bolinas Bay or smaller. Map showing the San Gregorio fault zone and other major Holocene faults in the western San Francisco Bay area. 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. EMBED (for wordpress.com hosted blogs and archive.org item tags) Want more? The San Francisco Bay Area also suffers from the unfortunate confluence of large populations and active faults. Each of these fault zones has important offshore sections that, until recently, were not mapped in great detail. Measurements of so … Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. 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. Here's a map of the significant fault lines and strong earthquakes in the Bay Area. And despite San Francisco’s legendary 1906 earthquake, the San Andreas Fault does not go through the city. Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). 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). Archived report (descriptions no longer maintained) San Gregorio fault zone, San Gregorio section (Class A) No. 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. 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 . This is the Santa Cruz coastline and you have seen this area in past labs. 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. 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. 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. The known faults in the San Francisco area include the San Andreas, the Hayward, the Rodgers Creek and the San Gregorio. For the most up-to-date information, please refer to the interactive fault map. The San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. 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. The Instrumental Intensity map is based on a combined regression of recorded peak acceleration and velocity amplitudes. ... Hayward, Mt. 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. 3). The San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. 2 Fig. Both communities are situated inland of state beaches that share their names. 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. This is the Santa Cruz coastline and you have seen this area in past labs. 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