Active aseismic creep on the Alto Tiberina low-angle normal fault, Italy

Research Article| August 01, 2009 Active aseismic creep on the Alto Tiberina low-angle normal fault, Italy Sigrún Hreinsdóttir; Sigrún Hreinsdóttir 1Department of Geosciences, University of Arizona, Gould-Simpson #77, 1040 E 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Richard A. Bennett Richard A. Bennett 1Department of Geosciences, University of Arizona, Gould-Simpson #77, 1040 E 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Sigrún Hreinsdóttir 1Department of Geosciences, University of Arizona, Gould-Simpson #77, 1040 E 4th Street, Tucson, Arizona 85721, USA Richard A. Bennett 1Department of Geosciences, University of Arizona, Gould-Simpson #77, 1040 E 4th Street, Tucson, Arizona 85721, USA Publisher: Geological Society of America Received: 13 May 2008 Revision Received: 05 Mar 2009 Accepted: 18 Mar 2009 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (8): 683–686. https://doi.org/10.1130/G30194A.1 Article history Received: 13 May 2008 Revision Received: 05 Mar 2009 Accepted: 18 Mar 2009 First Online: 03 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 Sigrún Hreinsdóttir, Richard A. Bennett; Active aseismic creep on the Alto Tiberina low-angle normal fault, Italy. Geology 2009;; 37 (8): 683–686. doi: https://doi.org/10.1130/G30194A.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 The existence of active low-angle normal faults has been questioned because the standard theory of fault mechanics precludes normal faults from slipping at low (<30°) dip angles, and there is an apparent deficiency of large normal fault earthquakes globally with a shallow dipping fault plane. The Alto Tiberina fault, Italy, is a low-angle normal fault (with dip 15°–20°) that has been clearly imaged with seismic reflection profiles and is highlighted by microseismicity. The fault is thought to be the main structure accommodating extension in the region. However, few large earthquakes have been documented on or near the fault for more than 2 ka. Analysis of data from a recently established network of continuous global positioning system (GPS) stations in the Umbria-March region, Italy, shows that the Alto Tiberina low-angle normal fault in the Northern Apennines is actively slipping at a shallow depth within the brittle crust. Crustal deformation models that best fit the GPS are consistent with both a shallow dip and active, mostly aseismic, creep of ~2.4 ± 0.3 mm/a below 4 ± 2 km locking depth along the Alto Tiberina fault. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.