Large-magnitude transient strain accumulation on the Blackwater fault, Eastern California shear zone

Abstract

Research Article| April 01, 2004 Large-magnitude transient strain accumulation on the Blackwater fault, Eastern California shear zone Michael Oskin; Michael Oskin 1Department of Geological Sciences, University of North Carolina, Chapel Hill, North Carolina 27599, USA Search for other works by this author on: GSW Google Scholar Alex Iriondo Alex Iriondo 2Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Michael Oskin 1Department of Geological Sciences, University of North Carolina, Chapel Hill, North Carolina 27599, USA Alex Iriondo 2Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309, USA Publisher: Geological Society of America Received: 19 Sep 2003 Revision Received: 16 Dec 2003 Accepted: 17 Dec 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (4): 313–316. https://doi.org/10.1130/G20223.1 Article history Received: 19 Sep 2003 Revision Received: 16 Dec 2003 Accepted: 17 Dec 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Michael Oskin, Alex Iriondo; Large-magnitude transient strain accumulation on the Blackwater fault, Eastern California shear zone. Geology 2004;; 32 (4): 313–316. doi: https://doi.org/10.1130/G20223.1 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 SocietyGeology Search Advanced Search Abstract We investigate the Quaternary slip rate for the Blackwater fault, Eastern California shear zone, through mapping and geochronology of offset volcanic rocks. Basalt flows of the Black Mountains support the presence of faulting at 3.77 ± 0.11 Ma, 1.8 ± 0.1 km of subsequent slip, and a well-constrained long-term slip rate of 0.49 ± 0.04 mm/yr. Total slip diminishes northward, evidenced by a 0.3–1.8 km offset of a 7.23 ± 1.07 Ma dacite flow in the Black Hills and fault termination in the Lava Mountains, 5 km short of the Garlock fault. Slow long-term slip rate together with sparse evidence for Holocene rupture contradict predictions of rapid slip rate from tectonic geodesy. These results support the conclusion that as much as 95% of geodetic strain accumulation across the Blackwater fault, and thus from 1 to 6 mm/yr of geodetic strain measured across the Eastern California shear zone, is a transitory phenomenon. Discrepant geologic and geodetic results may indicate an increased near-term seismic hazard, but merit caution for interpretation of fault slip rates from geodesy alone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.