Our case study documents this combination of pervasive brittle deformation and sandstone injection along fault structures, which can ultimately disrupt the integrity of a host unit leading top seal failure and leakage … Illustration by MBARI. [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). 0000000938 00000 n
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The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. 6.3 Intersection of Bunker Hill Drive. 0000001149 00000 n
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From this unique vantage point it measures movements in the Pacific continental plate. EMBED. 60a This zone appears to connect with faults mapped on land near Ano Nuevo Point and Point Sur. The Hunting Creek, Berryessa, Green Valley, Concord fault system right behind at 16 percent and the San Gregorio fault line follows at 6 percent. 0
The right‐lateral San Gregorio and San Andreas faults meet west of the Golden Gate near San Francisco. 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 … 0000002771 00000 n
The San Andreas fault is third at 22 percent. )&���.J�����(�?��
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The San Andreas Fault crosses the west end of the Highway 92 causeway. 0000008673 00000 n
The red line shows the location of a seismic refraction and reflection cross‐section model. endstream
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San Gregorio Fault is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. 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. trailer
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Si?�����*1��Z��. 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. ���b�p�:��g' ����m�/�_�P���Ra�F;a^�A���ӧO���Y>�cU3*3 J�> ��%W��'���f��\r��j�@�f'��A�|���Su�{�lI� Č@Oh00�9ơ@:(,ỄBh�Z6�8H�Q(�d�A$����!�1��s��@Rab?�>�[�i5��s�كA���aɊ��cf��"�? Looking down at Año Nuevo State Park from the air, you can see the work of the San Gregorio Fault plainly. 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 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. [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 Palo Colorado-San Gregorio fault zone parallels the Hayward fault and resembles that fault in length, seismicity, and sense of movement. The San Gregorio fault approaches the more northwest trending San Andreas fault in the offshore Golden Gate region. For the most up-to-date information, please refer to the interactive fault map. YJ�tG�WA
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\=�@1]OB9b��|J These fault zones are seismically active, and in many places offset the seafloor or Quaternary sedimentary rocks (Greene et al. If you would like to participate, you can choose to edit this article, or visit the project page for more information. 0000003293 00000 n
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. 98 0 obj<>stream
The MBNMS is located along the active transform boundary (the San Andreas fault system) separating the Pacific Plate from the North American Plate. 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. 1c). 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 San Gregorio fault, west of the San … The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. ��Y�XXF���jo�R����FJ���ڛ]�ם�͂,Nr��)�M&�8e�[}hF�|F�8��e�;=�N�t�v| �����+A����K��[�ƬG�Q��i6j��O�ƺ��"
o�� ��Nf-s�so�f��������,*�AtT�8Z�B��M��P�^�ޒ���Z��~T�}��b�58�Y��ڝ"�7�@y�b����,� J��%���ㅆL�VL���'�� ����>���w�q��s�a���9�ֺ�Ɉ� 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. 0000002052 00000 n
The San Gregorio Fault continues on its right-ward progress, dragging the westward/seaward portions of Año Nuevo to the northwest. The San Gregorio Fault is part of a system of coastal faults which run roughly parallel to the San Andreas. 0000000576 00000 n
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. Here, thanks to the USGS, is the relevant part of a detailed geological map of the area. The San Gregorio fault branches off of the San Andreas fault zone at Bolinas Lagoon, north of the Golden Gate extending in a south-southeasterly direction to the vicinity of Point Sur where it may possibly connect with the Sur-Nacimiento fault that in turn connects with the San Simeon, and Hosgri faults forming a 450 km long coastal boundary fault. 0000002807 00000 n
The San Gregorio fault forms part of the San Andreas fault system, a plate boundary that has been accommodating motion between the Pacific and … startxref
MBARI’s seafloor seismometer (“MOBB”) sits west of it, on the opposite side of the fault from almost all California seismometers. San Gregorio-Hosgri fault zone, California Item Preview remove-circle Share or Embed This Item. 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 map area straddles the right-lateral San Gregorio Fault zone, a prominent structure west of the San Andreas Fault in the broader San Andreas Fault system. 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. 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. lD�����Y���:F4}
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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). Learn how to create your own. 0000001306 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. %PDF-1.4
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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. 0000003047 00000 n
The known faults in the San Francisco area include the San Andreas, the Hayward, the Rodgers Creek and the San Gregorio. Geomorphic, sedimentologic, and tectonic data collected along a double restraining bend at Pillar Point Bluff in San Mateo County, California identifies a strand of the San Gregorio Fault, referred to as the Middle Strand, that trends down the middle of Pillar Point Bluff, exhibits significant oblique slip, and may play a more prominent role than previously understood. 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 0000003370 00000 n
• 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 … x�b```f``������>�A�D�b ���(�$d�������s@x#����3̷ We provide an extensive high‐resolution geophysical, sediment core, and radiocarbon dataset to address late Pleistocene and Holocene fault activity of the San Gregorio fault zone (SGFZ), offshore central California. This map was created by a user. 1973, 1989; Greene 1977, 1990; McCulloch and Greene 199… The San Gregorio fault is the westernmost fault in the San Andreas fault system. %%EOF
Archived report (descriptions no longer maintained) San Gregorio fault zone, San Gregorio section (Class A) No. The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the 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 … In and south of the San Francisco Bay area, a significant portion of dextral slip is partitioned onto several faults of the San Andreas fault system, including the San Gregorio [60] on the west, and the Calaveras [54] and Hayward [55] faults on the east. 0000000016 00000 n
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). Open in figure viewer PowerPoint. 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. Continue north on Skyline Boulevard. w�-�
�rC7�X�z�^�z�,c$wtNۮ�"�ǚrh�ٳ����� ����ҰA�C�ȶ�y����pjI@��RlQQO�mI6��J��u�ޙ{j5ڢUdF�#��>�ζN��{�+)g���H��5'*kd�+��8�|�)�$��݁Mx�ɘK�w2����,�R%�1��M�j��Y>�ZO�K�8��Nؽg��7!,���T�Y7�$����3�6`�b��u�v��Q�$Z-������"�qZnڲݨ��WY���{�-�y%�$;J��I�Tc��2NKt�����uwhȗ�o�72���Y�jwf�ϩ{VgK��Y���kq�7oQS(K6�>�s�p��X�2������q�t惭��m#��)]Edj.i7A6J�і:� ѯr��ST,8���-I�f/�n��`���Imk��c���t�Ae}g�u����Q,x����qdͪ)�P�����.�)Z+�7. Company spokesman Blair Jones said in a statement that experts have evaluated a potential rupture linking the Hosgri with several other faults, including the San Gregorio fault … Wikiproject Geology, san gregorio fault attempt at creating a standardized, informative, comprehensive and easy-to-use Geology resource location a... Of 7 to 7.25 work of the area the San Gregorio fault continues on its right-ward progress dragging! Easy-To-Use Geology resource its right-ward progress, dragging the westward/seaward portions of Año Nuevo to the USGS, the. 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