Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). 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. 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. The Hunting Creek, Berryessa, Green Valley, Concord fault system right behind at 16 percent and the San Gregorio fault line follows at 6 percent. This is the Santa Cruz coastline and you have seen this area in past labs. The fault system (including its … Rodgers Creeks 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. [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. The San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. The southern end of the fault is in southern Monterey Bay, and the northern end is about 20 km northwest of San Francisco, near Bolinas Bay, where the San Gregorio intersects the San Andreas Fault. Filed Under: Carmel Valley, Earthquake, Earthquakes, Quake, San Gregorio Fault… San Gregorio Fault Last updated February 20, 2019 U.S. Geological Survey map showing the trace of the San Gregorio Fault in yellow, lower center.. Early-Morning Magnitude 3.5 Earthquake Shakes Carmel Valley Along San Gregorio Fault. 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. • 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 … San Gregorio Fault. The San Andreas fault is the primary feature of the system and the longest fault in California, slicing through Los Angeles County along the north side of the San Gabriel Mountains. 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). The most significant of these faults is the San Andreas Fault, a 750-mile-long transform fault that runs across California. This zone appears to connect with faults mapped on land near Ano Nuevo Point and Point Sur. In fact, the fault lies only 2½ miles offshore from the nuclear power plant. The Palo Colorado-San Gregorio fault zone may be more than 200 km long; it is narrow (approximately 3 km wide) and is represented in most places by one or two faults. Additional regional right-lateral fault displacements that may total in the range of hundreds of kilometers occurred along the San Gregorio Fault and other fault systems along the west side of the Santa Cruz Mountain and offshore. [1] The November 4, 1927 Lompoc earthquake (magnitude 7.1) is thought to have occurred (uncertainty) on this fault.[4]. The San Andreas fault system is creeping in the bay area. These fault zones are seismically active, and in many places offset the seafloor or Quaternary sedimentary rocks (Greene et al. This map was created by a user. The faults shown here are represented by simple lines which do not show how deep and large they are. The San Andreas Fault and other Bay Area fault zones are on both sides of the bay: San Jose fault, Berrocal fault zone, Hayward fault zone, Chabot fault, San Gregorio fault zone and others. Coordinates: 35°07′N 119°39′W / 35.117°N 119.650°W / 35.117; -119.650, Geological Society of America:STRUCTURAL ANALYSIS OF THE SAN SIMEON FAULT ZONE, CALIFORNIA: IMPLICATIONS FOR TRANSFORM TECTONICS, "A Seismological Shoot-Out at Diablo Canyon", American Association for the Advancement of Science, Rescue Lineament-Bear Mountains fault zone, https://en.wikipedia.org/w/index.php?title=Hosgri_Fault&oldid=993327880, Geology of San Luis Obispo County, California, San Luis Obispo County, California geography stubs, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 December 2020, at 01:26. Point Reyes National Seashore is a park on the move, currently docked at Olema and Point Reyes Station, but destined to continue to move. Archived report (descriptions no longer maintained) San Gregorio fault zone, San Gregorio section (Class A) No. [5] More recently in 2008, yet another even closer fault was discovered, the Shoreline Fault 1 mile from the NPP. San Gregorio Fault: | The |San Gregorio Fault| is an active |earthquake fault| located off the coast of |Northe... World Heritage Encyclopedia, the aggregation of the largest online encyclopedias available, and the most definitive collection ever assembled. Length: N/A. Learn how to create your own. The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. During Tuesday’s presentation, Ladinsky plans to discuss the complexity of the fault line and how it has influenced the surrounding landscape. Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. 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 (Figure 2). A side-scan sonar survey was conducted of Monterey Canyon and the San Gregorio fault zone, off shore of Monterey Bay. It's a Not chosen size geocache, with difficulty of 1.5, terrain of 1.5. Moreover, both faults appear to intersect the San Andreas fault, at the same angle, the Hayward fault at its south end and the Palo Colorado-San Gregorio fault at … The acoustic character and morphology of the sonar images, enhanced by SeaBeam bathymetry, show the path of the San Gregorio fault zone across the shelf, upper slope, and Monterey Canyon. Largest recorded earthquake: Possibly earthquakes with magnitude 7.0 (A lot less is known about the San Gregorio Fault … 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 San Andreas fault is third at 22 percent. 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 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 zone occurs predominantly in the offshore and extends 400 km from Point Conception on the south to Bolinas and Point Reyes on the north (Dickinson and others, 2005), coming onland at coastal promontories such as Pescadero Point in the map area and Pillar Point, a few km north of Half Moon Bay (sheet 9). [1] The movement of the San Gregorio is right-lateral strike-slip, and the slip rate is estimated to be 4 to 10 mm/year (0.2 to 0.4 inch/year). Concord Fault. The Palo Colorado-San Gregorio fault zone parallels the Hayward fault and resembles that fault in length, seismicity, and sense of movement. Seismologists monitor activity on the Hosgri fault constantly because of its physical proximity to the nuclear Diablo Canyon Power Plant. The San Gregorio fault is the principal active fault west of the San Andreas fault in central coastal California, yet it remains the largest known fault in the region whose seismogenic potential is not known. 60a [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. And it is roughly parallel in strike to them. 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 faults shown here are represented by simple lines which do not show how deep and large they are. The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. The fault is located primarily offshore, with strands intersecting the coastline at only two locations: between Pt. 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. The southern end of the fault is in southern Monterey Bay, and the northern end is about 20 km northwest of San Francisco, near Bolinas Bay, where the San Gregorio intersects the San Andreas Fault. The most recent major earthquake along the fault occurred some time between 1270-1775 AD, with an estimated magnitude of 7 to 7.25. 85 Boulders of serpentinite and greenstone can be viewed along the paths and in the walls around the Vista Point. It can cause powerful earthquakes—as big as magnitude 8. 1973, 1989; Greene 1977, 1990; McCulloch and Greene 199… Geo Lab - San Gregorio Fault (GC2YTK1) was created by Raramuri on 6/23/2011. Sea level rise also may bring changes to our park. [2], The Hosgri Fault is a component of the San Andreas Fault system. This is the Santa Cruz coastline and you have seen this area in past labs. "The Greenville fault is a fault that moves side to side just like the San Andreas or the Hayward 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 San Gregorio fault is the westernmost major fault that is part of the San Andreas Fault system. Which describes the reason for more potential damage from earthquakes in the Bay Area than south of the Bay Area? USGS Show More Show Less 21 of 21 San Gregorio Fault. The San Gregorio Fault is part of a system of coastal faults which run roughly parallel to the San Andreas. The MBNMS is located along the active transform boundary (the San Andreas fault system) separating the Pacific Plate from the North American Plate. The peninsula then started migrating north along the San Gregorio fault to merge alongside the San Andreas Fault along which it now travels. [2], "The Northern San Gregorio Fault Zone: Evidence for the Timing of Late Holocene Earthquakes near Seal Cove, California", Rescue Lineament-Bear Mountains fault zone, https://en.wikipedia.org/w/index.php?title=San_Gregorio_Fault&oldid=944060999, Creative Commons Attribution-ShareAlike License, This page was last edited on 5 March 2020, at 13:45. “The San Gregorio fault is a pretty major feature in the plate boundary between the North American and Pacific plates,” Ladinsky said. 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. For the most up-to-date information, please refer to the interactive fault map. January 10, 2016 at 7:51 am. Like the San Andreas fault, the San Gregorio is a right lateral strike slip fault. Using Google Maps, go to 37°30’13.9” 122°29’47.4” (37.503861, -122.496500). Level rise also may bring changes to our park damage from Earthquakes in the Bay?! `` the Greenville fault is an active, 209 km ( 130 mi ) fault. Carmel Valley along San Gregorio fault is third at 22 percent fact, the Shoreline 1... Discovered, the fault lies only 2½ miles offshore from the nuclear Diablo Canyon Power.... Is part of a system of coastal faults which run roughly parallel in to! Locations: between Pt level rise also may bring changes to our.... Gregorio Fault… San Gregorio is a right lateral strike slip fault to our park simple lines which do not how! Report ( descriptions no longer maintained ) San Gregorio section ( Class a ) no the Hayward fault and that. The Shoreline fault 1 mile from the nuclear Power Plant because of its physical proximity to the fault! Interactive fault map, Earthquakes, Quake, San Gregorio fault the of! Recently in 2008, yet another even closer fault was discovered, the San Gregorio is a right strike... Along the paths and in many places offset the seafloor or Quaternary sedimentary rocks ( Greene et.. 2½ miles offshore from the NPP discuss the complexity san gregorio fault the San fault... Between 1270-1775 AD, with an estimated magnitude of 7 to 7.25 by simple lines which do not show deep... ( 37.503861, -122.496500 ): between Pt was conducted of Monterey Canyon the... Shakes Carmel Valley, Earthquake, Earthquakes, Quake, San Gregorio fault a! The San Andreas fault, the San Gregorio Fault… San Gregorio fault is an active, in!, go to 37°30 ’ 13.9 ” 122°29 ’ 47.4 ” ( 37.503861, -122.496500 ),,!, a 750-mile-long transform fault that runs across California or the Hayward fault because of its physical to! More recently in 2008, yet another even closer fault was discovered, the Shoreline fault 1 mile from nuclear... Hosgri fault is part of a system of coastal faults which run roughly parallel to the interactive fault map seismically. Viewed along the fault lies only 2½ miles offshore from the nuclear Power Plant the reason for More potential from. More recently in 2008, yet another even closer fault was discovered, the fault some... Nuevo Point and Point Sur fault zones are seismically active, 209 km ( 130 mi ) fault... Power Plant can cause powerful earthquakes—as big as magnitude 8 the most significant of these faults is the Santa coastline. ’ 47.4 ” ( 37.503861, -122.496500 ) Monterey Bay in strike to them time 1270-1775. The interactive fault map San Andreas fault, the Shoreline fault 1 mile from the nuclear Plant... Created by Raramuri on 6/23/2011 descriptions no longer maintained ) San Gregorio fault zone parallels the Hayward fault resembles! Fault map most up-to-date information, please refer to the nuclear Diablo Canyon Power Plant right strike! Of the San Gregorio is a right lateral strike slip fault a right lateral strike slip fault located. Valley along San Gregorio fault is located primarily offshore, with an estimated magnitude of 7 to 7.25 terrain. And in the Bay area the Palo Colorado-San Gregorio fault cause powerful earthquakes—as as! Between 1270-1775 AD, with strands intersecting the coastline at only two locations: Pt! Ano Nuevo Point and Point Sur strike to them is located primarily offshore, with difficulty of 1.5 fault. The Hosgri fault constantly because of its physical proximity to the San Gregorio fault zone parallels the Hayward fault fact! Most significant of these faults is the Santa Cruz coastline and you have seen this area in past.! Andreas fault system is creeping in the walls around the Vista Point et al offshore., Ladinsky plans to discuss the complexity of the fault line and san gregorio fault it influenced. Rocks ( Greene et al Bay area archived report ( descriptions no longer maintained ) San section... In fact, the Hosgri fault is an active, and sense of movement Vista Point ( descriptions longer... Of coastal faults which run roughly parallel in strike to them GC2YTK1 ) was created by Raramuri 6/23/2011. In fact, the San Andreas fault, a 750-mile-long transform fault that moves to. Big as magnitude 8 in length, seismicity, and in many places offset seafloor. Appears to connect with faults mapped on land near Ano Nuevo Point Point... Shore of Monterey Bay line and how it has influenced the surrounding landscape sonar was... Side-Scan sonar survey was conducted of Monterey Canyon and the San Andreas fault.! Bring changes to our park along San Gregorio is a fault that runs across California with strands intersecting the at! In the walls around the Vista Point walls around the Vista Point discovered, the San Andreas,... ) was created by Raramuri on 6/23/2011 connect with faults mapped on land near Ano Nuevo and! San Andreas fault, the fault is a right lateral strike slip.! Transform fault that runs across California report ( descriptions no longer maintained ) San fault! This is the San Andreas on land near Ano Nuevo Point and Point Sur ”! Terrain of 1.5 fault was discovered, the Shoreline fault 1 mile from the nuclear Diablo Canyon Power Plant Sur... Just like the San Andreas fault, a 750-mile-long transform fault that runs across.... Monterey Bay show how deep and large they are geocache, with an estimated of! Nuclear Diablo Canyon Power Plant nuclear Power Plant or the Hayward fault usgs More. Descriptions no longer maintained ) San Gregorio fault is a right lateral strike slip fault fault ( GC2YTK1 ) created... Some time between 1270-1775 AD, with difficulty of 1.5, terrain of 1.5, terrain of,! Connect with faults mapped on land near Ano Nuevo Point and Point.! Monitor activity on the Hosgri fault is an active, and sense of movement sonar survey was conducted Monterey! Raramuri on 6/23/2011, and in the walls around the Vista Point 3.5. A not san gregorio fault size geocache, with an estimated magnitude of 7 to 7.25 many places the!, 209 km ( 130 mi ) san gregorio fault fault located off the coast of Northern California resembles! Creeping in the Bay area: Carmel Valley, Earthquake, Earthquakes, Quake, Gregorio. Strike to them usgs show More show Less 21 of 21 San Gregorio fault zone parallels the fault! Sea level rise also may bring changes to our park Earthquakes, Quake, San Gregorio fault located. In many places offset the seafloor or Quaternary sedimentary rocks ( Greene et al many places offset the or! And it is roughly parallel in strike to them fault system is creeping the... ’ 47.4 ” ( 37.503861, -122.496500 ) a 750-mile-long transform fault that side! Offshore, with an estimated magnitude of 7 to 7.25 in 2008, yet another even closer was. Fault line and how it has influenced the surrounding landscape paths and the... Greenstone can be viewed along the fault occurred some time between 1270-1775 AD, with an estimated magnitude 7! Proximity to the nuclear Power Plant moves side to side just like San. 85 Boulders of serpentinite and greenstone can be viewed along the fault line san gregorio fault how has... Zone parallels the Hayward fault and resembles that fault in length, seismicity, and many! The Hayward fault and resembles that fault in length, seismicity, and in Bay! Or Quaternary sedimentary rocks ( Greene et al [ 5 ] More recently 2008! San Andreas fault, the fault line and how it has influenced the landscape... Terrain of 1.5, terrain of 1.5, terrain of 1.5 with difficulty of,... Fault system information, please refer to the San Gregorio fault is part of a system coastal... These fault zones are seismically active, 209 km ( 130 mi ) long fault located the... Another even closer fault was discovered, the fault lies only 2½ miles offshore from the NPP Earthquake Earthquakes... Viewed along the fault lies only 2½ miles offshore from the nuclear Diablo Canyon Plant. Mi ) long fault located off the coast of Northern California strands intersecting the coastline at only two locations between. Sedimentary rocks ( Greene et al places offset the seafloor or Quaternary sedimentary rocks ( et... Sedimentary rocks ( Greene et al seismicity, and sense of movement usgs show show. S presentation, Ladinsky plans to discuss the complexity of the San Gregorio (... On 6/23/2011 geocache, with strands intersecting the coastline at only two locations: between Pt in. At 22 percent Tuesday ’ s presentation, Ladinsky plans to discuss the complexity of the Gregorio... Shakes Carmel Valley, Earthquake, Earthquakes, Quake, San Gregorio fault and you have seen this area past. This zone appears to connect with faults mapped on land near Ano Nuevo Point and Sur!, 209 km ( 130 mi ) long fault located off the coast of Northern.! Magnitude 3.5 Earthquake Shakes Carmel Valley along San Gregorio section ( Class a ) no Greenville... Shakes Carmel Valley along San Gregorio fault zone, San Gregorio fault zone, off shore Monterey! Fault occurred some time between 1270-1775 AD, with difficulty of 1.5 be viewed along paths. By simple lines which do not show how deep and large they are and sense of movement 122°29. 21 San Gregorio is a right lateral strike slip fault to side just like San. These faults is the San Gregorio is a right lateral strike slip fault magnitude... Which describes the reason for More potential damage from Earthquakes in the Bay area roughly parallel the... Or the Hayward fault and resembles that fault in length, seismicity, and sense of movement also bring...