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Late Holocene slip rate of the San Andreas Fault and its accommodation by creep and moderate-magnitude earthquakes at Parkfield, California
Investigation of a right-laterally offset channel at the Miller's Field paleoseismic site yields a late Holocene slip rate of 26.2 +6.4/-4.3 mm/yr (1σ) for the main trace of the San Andreas fault at Parkfield, California. This is the first well-documented geologic slip rate between the Carrizo...
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Published in: | Geology (Boulder) 2011-03, Vol.39 (3), p.243-246 |
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creator | Toké, Nathan A Arrowsmith, J. Ramón Rymer, Michael J Landgraf, Angela Haddad, David E Busch, Melanie M Coyan, Joshua A Hannah, Alexander |
description | Investigation of a right-laterally offset channel at the Miller's Field paleoseismic site yields a late Holocene slip rate of 26.2 +6.4/-4.3 mm/yr (1σ) for the main trace of the San Andreas fault at Parkfield, California. This is the first well-documented geologic slip rate between the Carrizo and creeping sections of the San Andreas fault. This rate is lower than Holocene measurements along the Carrizo Plain and rates implied by far-field geodetic measurements (∼35 mm/yr). However, the rate is consistent with historical slip rates, measured to the northwest, along the creeping section of the San Andreas fault ( |
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Ramón ; Rymer, Michael J ; Landgraf, Angela ; Haddad, David E ; Busch, Melanie M ; Coyan, Joshua A ; Hannah, Alexander</creator><creatorcontrib>Toké, Nathan A ; Arrowsmith, J. Ramón ; Rymer, Michael J ; Landgraf, Angela ; Haddad, David E ; Busch, Melanie M ; Coyan, Joshua A ; Hannah, Alexander</creatorcontrib><description>Investigation of a right-laterally offset channel at the Miller's Field paleoseismic site yields a late Holocene slip rate of 26.2 +6.4/-4.3 mm/yr (1σ) for the main trace of the San Andreas fault at Parkfield, California. This is the first well-documented geologic slip rate between the Carrizo and creeping sections of the San Andreas fault. This rate is lower than Holocene measurements along the Carrizo Plain and rates implied by far-field geodetic measurements (∼35 mm/yr). However, the rate is consistent with historical slip rates, measured to the northwest, along the creeping section of the San Andreas fault (<30 mm/yr). The paleoseismic exposures at the Miller's Field site reveal a pervasive fabric of clay shear bands, oriented clockwise oblique to the San Andreas fault strike and extending into the uppermost stratigraphy. This fabric is consistent with dextral aseismic creep and observations of surface slip from the 28 September 2004 M6 Parkfield earthquake. Together, this slip rate and deformation fabric suggest that the historically observed San Andreas fault slip behavior along the Parkfield section has persisted for at least a millennium, and that significant slip is accommodated by structures in a zone beyond the main San Andreas fault trace.</description><identifier>ISSN: 0091-7613</identifier><identifier>EISSN: 1943-2682</identifier><identifier>DOI: 10.1130/G31498.1</identifier><language>eng</language><publisher>Boulder: Geological Society of America (GSA)</publisher><subject>accommodation zones ; active faults ; California ; Cenozoic ; clastic sediments ; clay ; creep ; Creep (materials) ; Deformation ; Earthquakes ; fabric ; Fabrics ; faults ; field studies ; Geology ; Holocene ; lateral faults ; Measurement ; Monterey County California ; Northwest ; paleoseismicity ; Parkfield California ; Parkfield earthquakes ; Quaternary ; right-lateral faults ; San Andreas Fault ; sediments ; Seismic phenomena ; Seismology ; Slip ; slip rates ; Stratigraphy ; Structural geology ; trenching ; United States ; upper Holocene</subject><ispartof>Geology (Boulder), 2011-03, Vol.39 (3), p.243-246</ispartof><rights>GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. 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Ramón</creatorcontrib><creatorcontrib>Rymer, Michael J</creatorcontrib><creatorcontrib>Landgraf, Angela</creatorcontrib><creatorcontrib>Haddad, David E</creatorcontrib><creatorcontrib>Busch, Melanie M</creatorcontrib><creatorcontrib>Coyan, Joshua A</creatorcontrib><creatorcontrib>Hannah, Alexander</creatorcontrib><title>Late Holocene slip rate of the San Andreas Fault and its accommodation by creep and moderate-magnitude earthquakes at Parkfield, California</title><title>Geology (Boulder)</title><description>Investigation of a right-laterally offset channel at the Miller's Field paleoseismic site yields a late Holocene slip rate of 26.2 +6.4/-4.3 mm/yr (1σ) for the main trace of the San Andreas fault at Parkfield, California. This is the first well-documented geologic slip rate between the Carrizo and creeping sections of the San Andreas fault. This rate is lower than Holocene measurements along the Carrizo Plain and rates implied by far-field geodetic measurements (∼35 mm/yr). However, the rate is consistent with historical slip rates, measured to the northwest, along the creeping section of the San Andreas fault (<30 mm/yr). The paleoseismic exposures at the Miller's Field site reveal a pervasive fabric of clay shear bands, oriented clockwise oblique to the San Andreas fault strike and extending into the uppermost stratigraphy. This fabric is consistent with dextral aseismic creep and observations of surface slip from the 28 September 2004 M6 Parkfield earthquake. 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Ramón</au><au>Rymer, Michael J</au><au>Landgraf, Angela</au><au>Haddad, David E</au><au>Busch, Melanie M</au><au>Coyan, Joshua A</au><au>Hannah, Alexander</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Late Holocene slip rate of the San Andreas Fault and its accommodation by creep and moderate-magnitude earthquakes at Parkfield, California</atitle><jtitle>Geology (Boulder)</jtitle><date>2011-03</date><risdate>2011</risdate><volume>39</volume><issue>3</issue><spage>243</spage><epage>246</epage><pages>243-246</pages><issn>0091-7613</issn><eissn>1943-2682</eissn><abstract>Investigation of a right-laterally offset channel at the Miller's Field paleoseismic site yields a late Holocene slip rate of 26.2 +6.4/-4.3 mm/yr (1σ) for the main trace of the San Andreas fault at Parkfield, California. This is the first well-documented geologic slip rate between the Carrizo and creeping sections of the San Andreas fault. This rate is lower than Holocene measurements along the Carrizo Plain and rates implied by far-field geodetic measurements (∼35 mm/yr). However, the rate is consistent with historical slip rates, measured to the northwest, along the creeping section of the San Andreas fault (<30 mm/yr). The paleoseismic exposures at the Miller's Field site reveal a pervasive fabric of clay shear bands, oriented clockwise oblique to the San Andreas fault strike and extending into the uppermost stratigraphy. This fabric is consistent with dextral aseismic creep and observations of surface slip from the 28 September 2004 M6 Parkfield earthquake. Together, this slip rate and deformation fabric suggest that the historically observed San Andreas fault slip behavior along the Parkfield section has persisted for at least a millennium, and that significant slip is accommodated by structures in a zone beyond the main San Andreas fault trace.</abstract><cop>Boulder</cop><pub>Geological Society of America (GSA)</pub><doi>10.1130/G31498.1</doi><tpages>4</tpages></addata></record> |
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subjects | accommodation zones active faults California Cenozoic clastic sediments clay creep Creep (materials) Deformation Earthquakes fabric Fabrics faults field studies Geology Holocene lateral faults Measurement Monterey County California Northwest paleoseismicity Parkfield California Parkfield earthquakes Quaternary right-lateral faults San Andreas Fault sediments Seismic phenomena Seismology Slip slip rates Stratigraphy Structural geology trenching United States upper Holocene |
title | Late Holocene slip rate of the San Andreas Fault and its accommodation by creep and moderate-magnitude earthquakes at Parkfield, California |
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