Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust
Plate motions in Southern California have undergone a transition from compressional and extensional regimes to a dominantly strikeâ€slip regime in the Miocene. Strikeâ€slip motion is most easily accommodated on vertical faults, and major transform fault strands in the region are typically mapped as...
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American Geophysical Union
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ftcaltechauth:oai:authors.library.caltech.edu:1nb57-vrm10 2024-09-15T18:35:41+00:00 Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust Schulte-Pelkum, Vera Ross, Zachary E. Mueller, Karl Benâ€Zion, Yehuda 2020-08 https://doi.org/10.1029/2020jb019525 unknown American Geophysical Union https://doi.org/10.7914/SN/CI https://doi.org/10.7914/SN/AZ https://doi.org/10.7914/SN/TA https://doi.org/10.7914/SN/XN_1998 https://doi.org/10.7914/SN/XD_2011 https://service.scedc.caltech.edu/eq-catalogs/date_mag_loc.php https://scedc.caltech.edu/research-tools/QTMcatalog.html https://doi.org/10.1002/essoar.10502174.1 https://doi.org/10.1029/2020jb019525 oai:authors.library.caltech.edu:1nb57-vrm10 eprintid:105024 resolverid:CaltechAUTHORS:20200819-101227576 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research. Solid Earth, 125(8), Art. No. e2020JB019525, (2020-08) reactivation receiver functions anisotropy seismicity tectonics inheritance info:eu-repo/semantics/article 2020 ftcaltechauth https://doi.org/10.1029/2020jb01952510.7914/SN/CI10.7914/SN/AZ10.7914/SN/TA10.7914/SN/XN_199810.7914/SN/XD_201110.1002/essoar.10502174.1 2024-08-06T15:35:04Z Plate motions in Southern California have undergone a transition from compressional and extensional regimes to a dominantly strikeâ€slip regime in the Miocene. Strikeâ€slip motion is most easily accommodated on vertical faults, and major transform fault strands in the region are typically mapped as near vertical on the surface. However, some previous work suggests that these faults have a dipping geometry at depth. We analyze receiver function arrivals that vary harmonically with back azimuth at all available broadband stations in the region. The results show a dominant signal from contrasts in dipping foliation as well as dipping isotropic velocity contrasts from all crustal depths, including from the ductile middle to lower crust. We interpret these receiver function observations as a dipping faultâ€parallel structural fabric that is pervasive throughout the region. The strike of these structures and fabrics is parallel to that of nearby fault surface traces. We also plot microseismicity on depth profiles perpendicular to major strikeâ€slip faults and find consistently NE dipping features in seismicity changing from near vertical (80–85°) on the Elsinore Fault in the Peninsular Ranges to 60–65° slightly further inland on the San Jacinto Fault to 50–55° on the San Andreas Fault. Taken together, the dipping features in seismicity and in rock fabric suggest that preexisting fabrics and faults may have acted as strain guides in the modern slip regime, with reactivation and growth of strikeâ€slip faults along northeast dipping fabrics both above and below the brittleâ€ductile transition. © 2020 American Geophysical Union. Issue Online: 28 July 2020; Version of Record online: 28 July 2020; Accepted manuscript online: 25 June 2020; Manuscript accepted: 22 June 2020; Manuscript revised: 02 June 2020; Manuscript received: 05 February 2020. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation ... Article in Journal/Newspaper Seismological Facilities for the Advancement of Geoscience and EarthScope Caltech Authors (California Institute of Technology) |
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Caltech Authors (California Institute of Technology) |
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topic |
reactivation receiver functions anisotropy seismicity tectonics inheritance |
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reactivation receiver functions anisotropy seismicity tectonics inheritance Schulte-Pelkum, Vera Ross, Zachary E. Mueller, Karl Benâ€Zion, Yehuda Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust |
topic_facet |
reactivation receiver functions anisotropy seismicity tectonics inheritance |
description |
Plate motions in Southern California have undergone a transition from compressional and extensional regimes to a dominantly strikeâ€slip regime in the Miocene. Strikeâ€slip motion is most easily accommodated on vertical faults, and major transform fault strands in the region are typically mapped as near vertical on the surface. However, some previous work suggests that these faults have a dipping geometry at depth. We analyze receiver function arrivals that vary harmonically with back azimuth at all available broadband stations in the region. The results show a dominant signal from contrasts in dipping foliation as well as dipping isotropic velocity contrasts from all crustal depths, including from the ductile middle to lower crust. We interpret these receiver function observations as a dipping faultâ€parallel structural fabric that is pervasive throughout the region. The strike of these structures and fabrics is parallel to that of nearby fault surface traces. We also plot microseismicity on depth profiles perpendicular to major strikeâ€slip faults and find consistently NE dipping features in seismicity changing from near vertical (80–85°) on the Elsinore Fault in the Peninsular Ranges to 60–65° slightly further inland on the San Jacinto Fault to 50–55° on the San Andreas Fault. Taken together, the dipping features in seismicity and in rock fabric suggest that preexisting fabrics and faults may have acted as strain guides in the modern slip regime, with reactivation and growth of strikeâ€slip faults along northeast dipping fabrics both above and below the brittleâ€ductile transition. © 2020 American Geophysical Union. Issue Online: 28 July 2020; Version of Record online: 28 July 2020; Accepted manuscript online: 25 June 2020; Manuscript accepted: 22 June 2020; Manuscript revised: 02 June 2020; Manuscript received: 05 February 2020. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation ... |
format |
Article in Journal/Newspaper |
author |
Schulte-Pelkum, Vera Ross, Zachary E. Mueller, Karl Benâ€Zion, Yehuda |
author_facet |
Schulte-Pelkum, Vera Ross, Zachary E. Mueller, Karl Benâ€Zion, Yehuda |
author_sort |
Schulte-Pelkum, Vera |
title |
Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust |
title_short |
Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust |
title_full |
Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust |
title_fullStr |
Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust |
title_full_unstemmed |
Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust |
title_sort |
tectonic inheritance with dipping faults and deformation fabric in the brittle and ductile southern california crust |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020jb019525 |
genre |
Seismological Facilities for the Advancement of Geoscience and EarthScope |
genre_facet |
Seismological Facilities for the Advancement of Geoscience and EarthScope |
op_source |
Journal of Geophysical Research. Solid Earth, 125(8), Art. No. e2020JB019525, (2020-08) |
op_relation |
https://doi.org/10.7914/SN/CI https://doi.org/10.7914/SN/AZ https://doi.org/10.7914/SN/TA https://doi.org/10.7914/SN/XN_1998 https://doi.org/10.7914/SN/XD_2011 https://service.scedc.caltech.edu/eq-catalogs/date_mag_loc.php https://scedc.caltech.edu/research-tools/QTMcatalog.html https://doi.org/10.1002/essoar.10502174.1 https://doi.org/10.1029/2020jb019525 oai:authors.library.caltech.edu:1nb57-vrm10 eprintid:105024 resolverid:CaltechAUTHORS:20200819-101227576 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2020jb01952510.7914/SN/CI10.7914/SN/AZ10.7914/SN/TA10.7914/SN/XN_199810.7914/SN/XD_201110.1002/essoar.10502174.1 |
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1810478885606785024 |