Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II
2003; Geological Society of America; Volume: 31; Issue: 2 Linguagem: Inglês
10.1130/0091-7613(2003)031 2.0.co;2
ISSN1943-2682
AutoresG. S. Fuis, R. W. Clayton, Paul M. Davis, T. Ryberg, William J. Lutter, D. A. Okaya, Egill Hauksson, C. Prodehl, Janice M. Murphy, M. L. Benthien, S. Baher, M. D. Kohler, Kristina Thygesen, G. W. Simila, G. R. Keller,
Tópico(s)Seismic Imaging and Inversion Techniques
ResumoResearch Article| February 01, 2003 Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II Gary S. Fuis; Gary S. Fuis 1Earthquakes Hazards Team, U.S. Geological Survey, Menlo Park, California 94025, USA Search for other works by this author on: GSW Google Scholar Robert W. Clayton; Robert W. Clayton 2Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar Paul M. Davis; Paul M. Davis 3Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, USA Search for other works by this author on: GSW Google Scholar Trond Ryberg; Trond Ryberg 4Division of Physics of the Earth and Disaster Research, GeoForschungsZentrum, Potsdam D-14473, Germany Search for other works by this author on: GSW Google Scholar William J. Lutter; William J. Lutter 5Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53711, USA Search for other works by this author on: GSW Google Scholar David A. Okaya; David A. Okaya 6Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Search for other works by this author on: GSW Google Scholar Egill Hauksson; Egill Hauksson 7Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar Claus Prodehl; Claus Prodehl 8Geophysical Institute, University of Karlsruhe, Karlsruhe D-76187, Germany Search for other works by this author on: GSW Google Scholar Janice M. Murphy; Janice M. Murphy 9Earthquake Hazards Team, U.S. Geological Survey, Menlo Park, California 94025, USA Search for other works by this author on: GSW Google Scholar Mark L. Benthien; Mark L. Benthien 10Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Search for other works by this author on: GSW Google Scholar Shirley A. Baher; Shirley A. Baher 11Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, USA Search for other works by this author on: GSW Google Scholar Monica D. Kohler; Monica D. Kohler 11Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, USA Search for other works by this author on: GSW Google Scholar Kristina Thygesen; Kristina Thygesen 12Geological Institute, University of Copenhagen, Copenhagen 1350, Denmark Search for other works by this author on: GSW Google Scholar Gerry Simila; Gerry Simila 13Department of Geological Sciences, California State University, Northridge, California 91330, USA Search for other works by this author on: GSW Google Scholar G. Randy Keller G. Randy Keller 14Department of Geological Sciences, University of Texas, El Paso, Texas 79968, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Gary S. Fuis 1Earthquakes Hazards Team, U.S. Geological Survey, Menlo Park, California 94025, USA Robert W. Clayton 2Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA Paul M. Davis 3Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, USA Trond Ryberg 4Division of Physics of the Earth and Disaster Research, GeoForschungsZentrum, Potsdam D-14473, Germany William J. Lutter 5Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53711, USA David A. Okaya 6Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Egill Hauksson 7Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, USA Claus Prodehl 8Geophysical Institute, University of Karlsruhe, Karlsruhe D-76187, Germany Janice M. Murphy 9Earthquake Hazards Team, U.S. Geological Survey, Menlo Park, California 94025, USA Mark L. Benthien 10Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Shirley A. Baher 11Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, USA Monica D. Kohler 11Department of Earth and Space Sciences, University of California, Los Angeles, California 90024, USA Kristina Thygesen 12Geological Institute, University of Copenhagen, Copenhagen 1350, Denmark Gerry Simila 13Department of Geological Sciences, California State University, Northridge, California 91330, USA G. Randy Keller 14Department of Geological Sciences, University of Texas, El Paso, Texas 79968, USA Publisher: Geological Society of America Received: 25 Mar 2002 Revision Received: 02 Oct 2002 Accepted: 03 Oct 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (2): 171–174. https://doi.org/10.1130/0091-7613(2003)031 2.0.CO;2 Article history Received: 25 Mar 2002 Revision Received: 02 Oct 2002 Accepted: 03 Oct 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Gary S. Fuis, Robert W. Clayton, Paul M. Davis, Trond Ryberg, William J. Lutter, David A. Okaya, Egill Hauksson, Claus Prodehl, Janice M. Murphy, Mark L. Benthien, Shirley A. Baher, Monica D. Kohler, Kristina Thygesen, Gerry Simila, G. Randy Keller; Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II. Geology 2003;; 31 (2): 171–174. doi: https://doi.org/10.1130/0091-7613(2003)031 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract We have constructed a composite image of the fault systems of the M 6.7 San Fernando (1971) and Northridge (1994), California, earthquakes, using industry reflection and oil test well data in the upper few kilometers of the crust, relocated aftershocks in the seismogenic crust, and LARSE II (Los Angeles Region Seismic Experiment, Phase II) reflection data in the middle and lower crust. In this image, the San Fernando fault system appears to consist of a decollement that extends 50 km northward at a dip of ∼25° from near the surface at the Northridge Hills fault, in the northern San Fernando Valley, to the San Andreas fault in the middle to lower crust. It follows a prominent aseismic reflective zone below and northward of the main-shock hypocenter. Interpreted upward splays off this decollement include the Mission Hills and San Gabriel faults and the two main rupture planes of the San Fernando earthquake, which appear to divide the hanging wall into shingle- or wedge-like blocks. In contrast, the fault system for the Northridge earthquake appears simple, at least east of the LARSE II transect, consisting of a fault that extends 20 km southward at a dip of ∼33° from ∼7 km depth beneath the Santa Susana Mountains, where it abuts the interpreted San Fernando decollement, to ∼20 km depth beneath the Santa Monica Mountains. It follows a weak aseismic reflective zone below and southward of the main-shock hypocenter. The middle crustal reflective zone along the interpreted San Fernando decollement appears similar to a reflective zone imaged beneath the San Gabriel Mountains along the LARSE I transect, to the east, in that it appears to connect major reverse or thrust faults in the Los Angeles region to the San Andreas fault. However, it differs in having a moderate versus a gentle dip and in containing no mid-crustal bright reflections. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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