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- W2134267944 abstract "Research Article| September 01, 2007 Structure, deformation, and strength of the Loma Prieta fault, northern California, USA, as inferred from the 1989–1990 Loma Prieta aftershock sequence Robert J. Twiss; Robert J. Twiss 1Geology Department, University of California at Davis, Davis, California 95616, USA Search for other works by this author on: GSW Google Scholar Jeffrey R. Unruh Jeffrey R. Unruh 2William Lettis and Associates, 1777 Botelho Dr., Suite 262, Walnut Creek, California 94596, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Robert J. Twiss 1Geology Department, University of California at Davis, Davis, California 95616, USA Jeffrey R. Unruh 2William Lettis and Associates, 1777 Botelho Dr., Suite 262, Walnut Creek, California 94596, USA Publisher: Geological Society of America Received: 20 Jan 2006 Revision Received: 06 Dec 2006 Accepted: 08 Jan 2007 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2007) 119 (9-10): 1079–1106. https://doi.org/10.1130/B25976.1 Article history Received: 20 Jan 2006 Revision Received: 06 Dec 2006 Accepted: 08 Jan 2007 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Robert J. Twiss, Jeffrey R. Unruh; Structure, deformation, and strength of the Loma Prieta fault, northern California, USA, as inferred from the 1989–1990 Loma Prieta aftershock sequence. GSA Bulletin 2007;; 119 (9-10): 1079–1106. doi: https://doi.org/10.1130/B25976.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Analysis of aftershock focal mechanisms of the October 1989, M 7.1 Loma Prieta earthquake reveals details of structure and deformation. Aftershocks below 4–6 km define an alignment plane oriented (131°, 65°). This alignment includes three planar segments defining a restraining bend in a blind strike-slip fault. Dextral strike-slip dominates in the south, and reverse-dextral slip dominates in the north, a distribution similar to slip during the main shock. Above this fault, dominantly reverse faults striking roughly 110° lie en echelon along the main fault trend.In the 17 sets of spatially clustered aftershocks, a more complex substructure is defined by local planar hypocenter alignments and by preferred orientations of aftershock shear planes. The maximum shortening axes make angles with the normal to these planes that average 𝛉 ≈ 46° and 𝛉 ≈ 53°, respectively. These angles are incompatible with a weak fault, for which 0° ≤ 𝛉 ≤ 20°. Orientations of preferred aftershock shear planes resemble Riedel shears relative to local hypocenter alignment planes. The similarity of slip distributions inferred from the aftershock inversions and from the main shock implies that the stress drop during the main shock was incomplete and, thus, that the Loma Prieta fault is not unusually weak.Triaxial brittle deformation is partitioned into a pair of plane strains rotated relative to each other about a common principal axis. The shape of the triaxial strain ellipsoid determines the angle of rotation. Evidence supports our micropolar model of brittle deformation, which predicts that the antisymmetric part of the seismic moment tensor records effects of block rotations. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2134267944 title "Structure, deformation, and strength of the Loma Prieta fault, northern California, USA, as inferred from the 1989-1990 Loma Prieta aftershock sequence" @default.
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