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Seismically induced slump on an extremely gentle slope (<1°) of the Pleistocene Tecopa paleolake (California)

2011; Geological Society of America; Volume: 39; Issue: 11 Linguagem: Inglês

10.1130/g32218.1

1943-2682

Francisco Juan García-Tortosa, P. Alfaro, Luís Gibert, G. R. Scott,

earthquake and tectonic studies

Research Article| November 01, 2011 Seismically induced slump on an extremely gentle slope (<1°) of the Pleistocene Tecopa paleolake (California) Francisco J. García-Tortosa; Francisco J. García-Tortosa * 1Departamento Geología, Facultad Ciencias, Universidad de Jaén, Campus Las Lagunillas, 23071 Jaén, Spain *E-mail: gtortosa@ujaen.es. Search for other works by this author on: GSW Google Scholar Pedro Alfaro; Pedro Alfaro 2Departamento Ciencias de la Tierra y del Medio Ambiente, Facultad Ciencias, Universidad de Alicante, 03080 Alicante, Spain Search for other works by this author on: GSW Google Scholar Luis Gibert; Luis Gibert 3Departament de Petrologia, Geoquímica i Prospeció Geològica, Universitat de Barcelona, Martí Franqués s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Gary Scott Gary Scott 4Berkeley Geochronology Center, 2455 Ridge Road, 94709 Berkeley, California, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Francisco J. García-Tortosa * 1Departamento Geología, Facultad Ciencias, Universidad de Jaén, Campus Las Lagunillas, 23071 Jaén, Spain Pedro Alfaro 2Departamento Ciencias de la Tierra y del Medio Ambiente, Facultad Ciencias, Universidad de Alicante, 03080 Alicante, Spain Luis Gibert 3Departament de Petrologia, Geoquímica i Prospeció Geològica, Universitat de Barcelona, Martí Franqués s/n, 08028 Barcelona, Spain Gary Scott 4Berkeley Geochronology Center, 2455 Ridge Road, 94709 Berkeley, California, USA *E-mail: gtortosa@ujaen.es. Publisher: Geological Society of America Received: 02 Mar 2011 Revision Received: 13 Jun 2011 Accepted: 21 Jun 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (11): 1055–1058. https://doi.org/10.1130/G32218.1 Article history Received: 02 Mar 2011 Revision Received: 13 Jun 2011 Accepted: 21 Jun 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Francisco J. García-Tortosa, Pedro Alfaro, Luis Gibert, Gary Scott; Seismically induced slump on an extremely gentle slope (<1°) of the Pleistocene Tecopa paleolake (California). Geology 2011;; 39 (11): 1055–1058. doi: https://doi.org/10.1130/G32218.1 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 A superbly exposed ∼5 km2 slump is developed in middle Pleistocene lacustrine deposits of the Tecopa Basin (California, United States). A subhorizontal detachment (<1°) with a single sheet ∼8 m thick is displaced eastward nearly 100 m. The different parts of the slump are continuously exposed for more than 1 km, with extensional structures in the head zone and contractional features in the intermediate and toe zones. Meter-scale normal faults and thrusts coexist with meter- to decameter-scale open folds, all of them detached, on a clay bed rich in sepiolite. These well-exposed deformation structures were produced by liquidization of the clay bed, due to the thixotropic behavior of the sepiolite. Processes such as oversteepening or sedimentary overloading are discarded in light of sedimentological and paleoenvironmental analyses. Thixotropic behavior of sepiolites might have been caused by seismic shaking related to regional faults that were capable of producing large earthquakes during the middle Pleistocene (between 579 and 200 ka). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.