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An exceptionally long paleoseismic record of a slow-moving fault: The Alhama de Murcia fault (Eastern Betic shear zone, Spain)

2012; Geological Society of America; Volume: 124; Issue: 9-10 Linguagem: Inglês

10.1130/b30558.1

1943-2674

María Ortuño, E. Masana, Eduardo García‐Meléndez, José J. Martínez Díaz, Petra Štěpančíková, Pedro P. Cunha, Reza Sohbati, Carolina Canora, Jan‐Pieter Buylaert, Andrew Murray,

Geological and Geochemical Analysis

Research Article| September 01, 2012 An exceptionally long paleoseismic record of a slow-moving fault: The Alhama de Murcia fault (Eastern Betic shear zone, Spain) María. Ortuño; María. Ortuño † 1Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla, 3001, 76230, Juriquilla, Querétaro, México2RiskNat Group, Departament de Geodinàmica i Geofisica, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain †E-mail: maria_ortuno@geociencias.unam.mx Search for other works by this author on: GSW Google Scholar Eulalia. Masana; Eulalia. Masana 2RiskNat Group, Departament de Geodinàmica i Geofisica, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Eduardo. García-Meléndez; Eduardo. García-Meléndez 3Área de Geodinámica Externa, Facultad de Ciencias Ambientales, Universidad de León, Campus de Vegazana, s/n, 24071 León, Spain Search for other works by this author on: GSW Google Scholar José. Martínez-Díaz; José. Martínez-Díaz 4Departamento de Geodinámica, Universidad Complutense de Madrid, Calle Jose A. Novais, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Petra. Štěpančíková; Petra. Štěpančíková 5Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovičkách 41, 18209 Prague 8, Czech Republic Search for other works by this author on: GSW Google Scholar Pedro P. Cunha; Pedro P. Cunha 6Department of Earth Sciences, IMAR–Marine and Environmental Research Centre, Universidade Coimbra, Largo Marquês de Pombal, 3000-272 Coimbra, Portugal Search for other works by this author on: GSW Google Scholar Reza. Sohbati; Reza. Sohbati 7Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark Search for other works by this author on: GSW Google Scholar Carolina. Canora; Carolina. Canora 4Departamento de Geodinámica, Universidad Complutense de Madrid, Calle Jose A. Novais, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Jan-Pieter. Buylaert; Jan-Pieter. Buylaert 7Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark Search for other works by this author on: GSW Google Scholar Andrew S. Murray Andrew S. Murray 7Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark Search for other works by this author on: GSW Google Scholar Author and Article Information María. Ortuño † 1Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla, 3001, 76230, Juriquilla, Querétaro, México2RiskNat Group, Departament de Geodinàmica i Geofisica, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Eulalia. Masana 2RiskNat Group, Departament de Geodinàmica i Geofisica, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Eduardo. García-Meléndez 3Área de Geodinámica Externa, Facultad de Ciencias Ambientales, Universidad de León, Campus de Vegazana, s/n, 24071 León, Spain José. Martínez-Díaz 4Departamento de Geodinámica, Universidad Complutense de Madrid, Calle Jose A. Novais, 28040 Madrid, Spain Petra. Štěpančíková 5Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovičkách 41, 18209 Prague 8, Czech Republic Pedro P. Cunha 6Department of Earth Sciences, IMAR–Marine and Environmental Research Centre, Universidade Coimbra, Largo Marquês de Pombal, 3000-272 Coimbra, Portugal Reza. Sohbati 7Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark Carolina. Canora 4Departamento de Geodinámica, Universidad Complutense de Madrid, Calle Jose A. Novais, 28040 Madrid, Spain Jan-Pieter. Buylaert 7Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark Andrew S. Murray 7Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark †E-mail: maria_ortuno@geociencias.unam.mx Publisher: Geological Society of America Received: 29 May 2011 Revision Received: 03 Feb 2012 Accepted: 07 Feb 2012 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2012 Geological Society of America GSA Bulletin (2012) 124 (9-10): 1474–1494. https://doi.org/10.1130/B30558.1 Article history Received: 29 May 2011 Revision Received: 03 Feb 2012 Accepted: 07 Feb 2012 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 María. Ortuño, Eulalia. Masana, Eduardo. García-Meléndez, José. Martínez-Díaz, Petra. Štěpančíková, Pedro P. Cunha, Reza. Sohbati, Carolina. Canora, Jan-Pieter. Buylaert, Andrew S. Murray; An exceptionally long paleoseismic record of a slow-moving fault: The Alhama de Murcia fault (Eastern Betic shear zone, Spain). GSA Bulletin 2012;; 124 (9-10): 1474–1494. doi: https://doi.org/10.1130/B30558.1 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 Most catastrophic earthquakes occur along fast-moving faults, although some of them are triggered by slow-moving ones. Long paleoseismic histories are infrequent in the latter faults. Here, an exceptionally long paleoseismic record (more than 300 k.y.) of a slow-moving structure is presented for the southern tip of the Alhama de Murcia fault (Eastern Betic shear zone), which is characterized by morphological expression of current tectonic activity and by a lack of historical seismicity. At its tip, the fault divides into a splay with two main faults bounding the Góñar fault system. At this area, the condensed sedimentation and the distribution of the deformation in several structures provided us with more opportunities to obtain a complete paleoseismic record than at other segments of the fault. The tectonic deformation of the system was studied by an integrated structural, geomorphological, and paleoseismological approach. Stratigraphic and tectonic features at six paleoseismic trenches indicate that old alluvial units have been repeatedly folded and thrusted over younger ones along the different traces of the structure. The correlation of the event timing inferred for each of these trenches and the application of an improved protocol for the infrared stimulated luminescence (IRSL) dating of K-feldspar allowed us to constrain a paleoseismic record as old as 325 ka. We identified a minimum of six possible paleo of Mw = 6–7 and a maximum mean recurrence interval of 29 k.y. This provides compelling evidence for the underestimation of the seismic hazard in the region. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.