Source model for the Mw 6.1, 31 March 2006, Chalan‐Chulan Earthquake (Iran) from InSAR |
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| Authors: | M Peyret F Rolandone S Dominguez Y Djamour B Meyer |
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| Institution: | 1. Université Montpellier 2, Géosciences Montpellier, 34095 Montpellier, France;2. CNRS, Géosciences Montpellier, CNRS, 34095 Montpellier, France;3. Université Pierre et Marie Curie – Paris 06, UMR 7072, F‐75005 Paris, France;4. CNRS, UMR 7072, F‐75005 Paris, France;5. National Cartographic Center, Tehran, Iran |
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| Abstract: | We use InSAR to measure deformation and kinematics of the Mw = 4.9 Borujerd (2005/05/03) and Mw = 6.1 Chalan‐Chulan (2006/03/31) earthquakes that occurred in the Zagros fold‐and‐thrust belt. The focal mechanism of the 2006 event is consistent with right lateral strike‐slip motion and the event ruptured the Dorud‐Borujerd segment of the Main Recent Fault. An Envisat interferogram spanning the 2006 event shows peak ground deformation of 9 cm in the satellite line‐of‐sight along a 10 km long fault portion. The interferogram spanning the 2005 earthquake is rather related to atmospheric artefact than to ground deformation. Dislocation models of the 2006 Chalan‐Chulan event indicate dextral slip amounting to a maximum of 90 cm at a depth of 4 km. The predicted vertical displacements are in good agreement with differential levelling data. The 2006 event filled only a small part of the seismic gap located between large M = 7 events that occurred in 1909 and 1957. |
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