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Evidence for near-frictionless faulting in the 1989 (M 6.9) Loma Prieta, California, earthquake and its aftershocks

1993; Geological Society of America; Volume: 21; Issue: 2 Linguagem: Inglês

10.1130/0091-7613(1993)021 2.3.co;2

1943-2682

Mark D. Zoback, Gregory C. Beroza,

Geological and Geochemical Analysis

Research Article| February 01, 1993 Evidence for near-frictionless faulting in the 1989 (M 6.9) Loma Prieta, California, earthquake and its aftershocks Mark D. Zoback; Mark D. Zoback 1Department of Geophysics, Stanford University, Stanford, California 94305-2215 Search for other works by this author on: GSW Google Scholar Gregory C. Beroza Gregory C. Beroza 1Department of Geophysics, Stanford University, Stanford, California 94305-2215 Search for other works by this author on: GSW Google Scholar Author and Article Information Mark D. Zoback 1Department of Geophysics, Stanford University, Stanford, California 94305-2215 Gregory C. Beroza 1Department of Geophysics, Stanford University, Stanford, California 94305-2215 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (2): 181–185. https://doi.org/10.1130/0091-7613(1993)021 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Mark D. Zoback, Gregory C. Beroza; Evidence for near-frictionless faulting in the 1989 (M 6.9) Loma Prieta, California, earthquake and its aftershocks. Geology 1993;; 21 (2): 181–185. doi: https://doi.org/10.1130/0091-7613(1993)021 2.3.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 Analysis of the unusually diverse right-lateral, left-lateral, reverse, and normal faulting aftershocks of the Loma Prieta earthquake reveals a systematic relation between fault-plane orientation and slip direction; right-lateral aftershock planes strike slightly more north-ward (10°-15°) than the main shock, left-lateral planes strike slightly more westward, reverse planes dip slightly less steeply, and normal planes dip slightly more steeply than the main shock. We demonstrate that these slip patterns are consistent with an approximately uniaxial stress field acting nearly perpendicular to the main-shock fault plane. These results imply an extremely weak fault zone, possibly resulting from near-lithostatic pore pressure. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.