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. 0000001306 00000 n
[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. MBARI’s seafloor seismometer (“MOBB”) sits west of it, on the opposite side of the fault from almost all California seismometers. 60a Here, thanks to the USGS, is the relevant part of a detailed geological map of the area. The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. The San Gregorio Fault continues on its right-ward progress, dragging the westward/seaward portions of Año Nuevo to the northwest. These fault zones are seismically active, and in many places offset the seafloor or Quaternary sedimentary rocks (Greene et al. Later, a series of brittle tectonic events, associated with the San Andreas/San Gregorio Fault System, caused remobilization and accumulation of sand along newly formed fault planes. The San Andreas fault runs on the west, while the Hayward fault is on the east and shifts into the Rodgers Creek fault northeast of the city. The San Gregorio Fault is part of a system of coastal faults which run roughly parallel to the San Andreas. 0000003370 00000 n
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. 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. Looking down at Año Nuevo State Park from the air, you can see the work of the San Gregorio Fault plainly.
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. x�b```f``������>�A�D�b ���(�$d�������s@x#����3̷ H�|W�r�H��+�D�0��}��Qێф�d��9��"�h Pj�3���ef���^�Z�^.�[��u��0�^�ޭV���j;�b�/>��iP�j�8��Wk�y�y�_���"+�2S�v%��J-� e��h�O��|�8 The San Gregorio fault, west of the San … 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. YJ�tG�WA
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\=�@1]OB9b��|J The most recent major earthquake along the fault occurred some time between 1270-1775 AD, with an estimated magnitude of 7 to 7.25. The San Gregorio fault is the westernmost fault in the San Andreas fault system. 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 San Andreas fault is third at 22 percent. %%EOF
Continue north on Skyline Boulevard. 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 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. 0000002771 00000 n
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If you would like to participate, you can choose to edit this article, or visit the project page for more information. A small east-facing scarp reveals the trace of the fault along a low hill on the eastern shore of the reservoir just north of Highway 92. 0000000938 00000 n
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