Temporal clustering of paleoseismic events on the Oued Fodda fault, Algeria

Abstract

Research Article| December 01, 1988 Temporal clustering of paleoseismic events on the Oued Fodda fault, Algeria F. H. Swan F. H. Swan 1Geomatrix Consultants, One Market Plaza, Spear Street Tower, Suite 717, San Francisco, California 94105 Search for other works by this author on: GSW Google Scholar Author and Article Information F. H. Swan 1Geomatrix Consultants, One Market Plaza, Spear Street Tower, Suite 717, San Francisco, California 94105 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (12): 1092–1095. https://doi.org/10.1130/0091-7613(1988)016<1092:TCOPEO>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 F. H. Swan; Temporal clustering of paleoseismic events on the Oued Fodda fault, Algeria. Geology 1988;; 16 (12): 1092–1095. doi: https://doi.org/10.1130/0091-7613(1988)016<1092:TCOPEO>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 Paleoseismic investigations of the Oued Fodda fault, which underwent surface-fault rupture during the Algeria earthquake of October 10, 1980 (Ms 7.3), indicate that the average recurrence interval based on the long-term geologic slip rate (past 100 ka) is at least an order of magnitude longer than the intervals between recent surface-faulting events, which are determined by radiocarbon dating of faulted colluvial deposits exposed in trenches across the fault. Evidence from trenches excavated across the 1980 surface rupture indicates that there have been at least three and possibly four surface-faulting events on the Oued Fodda fault during the past 1.5 ka (including the 1980 earthquake). The ages of the three most recent events are well constrained. The most recent event occurred in 1980; a surface-faulting event occurred before 320 ±220 C-14 yr B.P. (radiocarbon years before 1950) and after 875 ±240 yr B.P., and another event occurred just prior to deposition of a layer containing charcoal dated at 875 ±250 yr B.P. (i.e., about 900 yr ago). The average interval between the three most recent surface-faulting events on the Oued Fodda fault was about 450 yr. The cumulative slip on the Oued Fodda fault was produced by relatively short episodes characterized by frequent displacements (surface-faulting events every few hundred years) separated by long periods of quiescence lasting several thousands to tens of thousands of years. 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.