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. Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. This map makes it easier to relate the recorded ground motions to the expected felt and damage distribution. For the most up-to-date information, please refer to the interactive fault map. The San Francisco Bay Area also suffers from the unfortunate confluence of large populations and active faults. 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). 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 . The San 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. 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. This is the Santa Cruz coastline and you have seen this area in past labs. The complete fault zone, including the Rodgers Creek fault, is divided by seismologists into three segments – Rodgers Creek, Northern Hayward, and Southern Hayward. 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 Santa Cruz Mountains lie between the San Andreas Fault Zone and the San Gregorio Fault system. 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. ... Hayward, Mt. 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. Fault (geology) Northern California Monterey Bay San Francisco Bolinas Bay on 3 sheets 110 x 87 cm. 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. The Instrumental Intensity map is based on a combined regression of recorded peak acceleration and velocity amplitudes. 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. 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 San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. This is the Santa Cruz coastline and you have seen this area in past labs. 1. The known faults in the San Francisco area include the San Andreas, the Hayward, the Rodgers Creek and the San Gregorio. ... San Gregorio Fault (SGF) Southern San Gregorio (SGS) 7.0. Geo Lab - San Gregorio Fault (GC2YTK1) was created by Raramuri on 6/23/2011. Seismic profiling and earthquake epicenters have shown the approximate location of the fault zone across Monterey Bay (Fig. 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. The nearest significant onshore cultural centers in the map area are San Gregorio and Pescadero, both unincorporated communities with populations well under 1,000. Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). and 175 x 112 cm. Here's a map of the significant fault lines and strong earthquakes in the Bay Area. The MBNMS is located along the active transform boundary (the San Andreas fault system) separating the Pacific Plate from the North American Plate. Here, thanks to the USGS, is the relevant part of a detailed geological map of the area. It's a Not chosen size geocache, with difficulty of 1.5, terrain of 1.5. 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. Measurements of so … 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 study area is included between the Ben Lomond and the San Gregorio fault zones. No_Favorite. 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. 3). Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. b) Schematic structural map. 60a Archived report (descriptions no longer maintained) San Gregorio fault zone, San Gregorio section (Class A) No. or smaller. 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. 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. 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. 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. 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 Monterey Bay lies between the San Andreas Fault to the east and the San Gregorio Fault to the west. 2 Fig. • 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 … 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! 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. 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. 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. 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. Neotectonics of the Big Sur Bend, San Gregorio‐Hosgri fault system, central California. Modified from Jennings (1994), segment boundaries (rectangles) along the San Andreas fault after WGCEe (1990). EMBED. 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