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Stress Change and Fault Interaction from a Two Century‐Long Earthquake Sequence in the Central Tell Atlas, Algeria

2017; Seismological Society of America; Volume: 107; Issue: 6 Linguagem: Inglês

10.1785/0120170041

1943-3573

Jugurtha Kariche, Mustapha Meghraoui, Abdelhakim Ayadi, Mohamed‐Salah Boughacha,

Geological and Geochemical Analysis

Research Article| September 26, 2017 Stress Change and Fault Interaction from a Two Century‐Long Earthquake Sequence in the Central Tell Atlas, Algeria Jugurtha Kariche; Jugurtha Kariche aInstitut de Physique du Globe, CNRS‐UMR 7516, Geodynamics and Active Deformation, 5, rue René Descartes, 67084 Strasbourg, France, m.meghraoui@unistra.frdNow at Université des Sciences et de la Technologie Houari Boumediene (USTHB), Laboratoire de Geophysique, B.P. 32 El Alia, 16111 Bab Ezzouar, Algiers, Algeria. Search for other works by this author on: GSW Google Scholar Mustapha Meghraoui; Mustapha Meghraoui aInstitut de Physique du Globe, CNRS‐UMR 7516, Geodynamics and Active Deformation, 5, rue René Descartes, 67084 Strasbourg, France, m.meghraoui@unistra.fr Search for other works by this author on: GSW Google Scholar Abdelhakim Ayadi; Abdelhakim Ayadi bDepartment of Seismology, Centre de Recherche en Astronomy Astrophysique et Géophysique (CRAAG), Route de l'Observatoire, Bouzareah, 16000 Algiers, Algeria Search for other works by this author on: GSW Google Scholar Mohamed‐Salah Boughacha Mohamed‐Salah Boughacha cUniversité des Sciences et de la Technologie Houari Boumediene (USTHB), Laboratoire de Geophysique, B.P. 32 El Alia, 16111 Bab Ezzouar, Algiers, Algeria Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2017) 107 (6): 2624–2635. https://doi.org/10.1785/0120170041 Article history first online: 27 Sep 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jugurtha Kariche, Mustapha Meghraoui, Abdelhakim Ayadi, Mohamed‐Salah Boughacha; Stress Change and Fault Interaction from a Two Century‐Long Earthquake Sequence in the Central Tell Atlas, Algeria. Bulletin of the Seismological Society of America 2017;; 107 (6): 2624–2635. doi: https://doi.org/10.1785/0120170041 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 SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract A sequence of major seismic events reaching Ms 7.3, with thrust faulting mechanisms, occurred from 1891 to 2003 in the central Tell Atlas of Algeria located along the Africa–Eurasia plate boundary. Previous neotectonic investigations show that earthquake faults of the central Tell Atlas have the potential to generate large magnitude earthquakes. We calculate the level of stress change that promotes the occurrence of a seismic sequence, taking into account the earthquake fault parameters, their uncertainties, the eastward earthquake migration, the seismicity rate change, and the interseismic strain accumulation. The computed coulomb failure function (⁠ΔCFF⁠) includes the seismicity rate and the stress transfer with fault interaction. The ΔCFF modeling shows 0.1–0.8 bar increase on fault planes at 7 km depth with a friction coefficient μ′=0.4 with stress loading lobes on targeted coseismic fault zone and location of stress shadow across other thrust‐and‐fold structures of the central Tell Atlas. The coulomb modeling suggests a distinction in earthquake triggering between moderate‐sized zones and large earthquake rupture zones. Following the 2003 earthquake, Global Positioning System, Interferometric Synthetic Aperture Radar, leveling studies, and aftershocks show that postseismic cumulative moment release amounts to 17.08%, which suggests an additional static stress change. In addition, the presence of fluid and related poroelastic deformation is considered as another parameter that favors stress increase and fault interaction. Modeling the stress change and fault interaction near major cities may contribute to a better constraint of the seismic‐hazard assessment and risk mitigation in northern Algeria. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.