Paleoseismology; Dead Sea Fault; clustering; tectonic
Abstract :
[en] Temporal distribution of earthquakes is key to seismic hazard assessment. However, for most fault systems shortness of large earthquake catalogues makes this assessment difficult. Its unique long earthquake record makes the Dead Sea fault (DSF) exceptional to test earthquake behaviour models. A paleoseismological trench along the southern section of the DSF, revealed twelve surface-rupturing earthquakes during the last 8000 years, of which many correlate with past earthquakes reported in historical chronicles. These data allowed us building a rupture scenario for this area, which includes timing and rupture length for all significant earthquakes during the last two millenaries. Extending this rupture scenario to the entire DSF south of Lebanon, we were able to confirm the temporal-clustering hypothesis. Using rupture length and scaling laws, we have estimated average co-seismic slip for each past earthquake. The cumulated slip was then balanced with long-term tectonic loading to estimate the slip deficit for this part of DSF over the last 1600 years. The seismic-slip budget shows that the slip deficit is similarly high along the fault with a minimum of 2 meters, which suggests that an earthquake cluster might happen over the entire region in the near future.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lefevre, Marthe ; Université de Liège - ULiège > Sphères ; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, UMR 7154 CNRS, F-75005, Paris, France. mlefevre@ipgp.fr
Klinger, Yann ; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, UMR 7154 CNRS, F-75005, Paris, France
Al-Qaryouti, Mahmoud; Jordan Seismological Observatory, Ministry of Energy and Mineral Resources, Amman, Jordan
Le Béon, Maryline ; Department of Earth Sciences, National Central University, Taoyuan, Taiwan
Moumani, Khaled; Geological Mapping Division, Ministry of Energy and Mineral Resources, Amman, Jordan
Language :
English
Title :
Slip deficit and temporal clustering along the Dead Sea fault from paleoseismological investigations.
Publication date :
14 March 2018
Journal title :
Scientific Reports
eISSN :
2045-2322
Publisher :
Nature Publishing Group, Basingstoke, Hampshire, England
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