Shallow fault-zone dilatancy recovery after the 2003 Bam earthquake in Iran

Eric J. Fielding (), Paul R. Lundgren, Roland Bürgmann and Gareth J. Funning
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Eric J. Fielding: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Paul R. Lundgren: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Roland Bürgmann: University of California, Berkeley, California 94720, USA
Gareth J. Funning: University of California, Riverside, California 92521, USA

Nature, 2009, vol. 458, issue 7234, 64-68

Abstract: The 2003 Bam earthquake recovery The earthquake that devastated Bam, Iran, in 2003 ruptured a buried fault located directly beneath the city. The earthquake had large slip of more than 2 metres at depths of 3 to 7 km, but much less at the surface. Fielding et al. have used interferometric analysis of synthetic aperture radar images from the Envisat satellite to monitor the area for postseismic response in the fault zone following the earthquake. The mapping reveals localized compaction that indicates both afterslip and poroelastic rebound along parts of the fault, but also healing and compaction of co-seismic dilation in the upper 1 km of the fault zone. Such deformation spread through a fault zone volume may explain the observed shallow slip deficits for some strike-slip fault ruptures.

Date: 2009
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DOI: 10.1038/nature07817

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