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AGU: Geophysical Research Letters

 

Index Terms

  • Geodesy and Gravity: Seismic cycle related deformations
  • Geodesy and Gravity: Satellite geodesy: results
  • Seismology: Earthquake source observations
  • Seismology: Seismicity and tectonics
  • Geographic Location: Asia

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L20310, 5 PP., 2006
doi:10.1029/2006GL027193

Displacement field and slip distribution of the 2005 Kashmir earthquake from SAR imagery

E. Pathier

Centre for the Observation and Modelling of Earthquakes and Tectonics, Department of Earth Sciences, University of Oxford, Oxford, UK

E. J. Fielding

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

T. J. Wright

Centre for the Observation and Modelling of Earthquakes and Tectonics, Department of Earth Sciences, University of Oxford, Oxford, UK

R. Walker

Centre for the Observation and Modelling of Earthquakes and Tectonics, Department of Earth Sciences, University of Oxford, Oxford, UK

B. E. Parsons

Centre for the Observation and Modelling of Earthquakes and Tectonics, Department of Earth Sciences, University of Oxford, Oxford, UK

S. Hensley

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

The 8th October 2005 Kashmir Earthquake M w 7.6 involved primarily thrust motion on a NE-dipping fault. Sub-pixel correlation of ENVISAT SAR images gives the location of the 80 km-long fault trace (within 300–800 m) and a 3D surface displacement field with a sub-metric accuracy covering the whole epicentral area. The slip distribution inverted using elastic dislocation models indicates that slip occurs mainly in the upper 10 km, between the cities of Muzaffarabad and Balakot. The rupture reached the surface in several places. In the hanging wall, horizontal motions show rotation from pure thrust to oblique right-lateral motion that are not observed in the footwall. A segmentation of the fault near Muzaffarabad is also suggested. North of the city of Balakot, slip decreases dramatically, but a diffuse zone of mainly vertical surface displacements, which could be post-seismic, exists further north, where most of the aftershocks occur, aligned along the NW-SE Indus-Kohistan Seismic Zone.

Received 10 June 2006; accepted 14 September 2006; published 24 October 2006.

Citation: Pathier, E., E. J. Fielding, T. J. Wright, R. Walker, B. E. Parsons, and S. Hensley (2006), Displacement field and slip distribution of the 2005 Kashmir earthquake from SAR imagery, Geophys. Res. Lett., 33, L20310, doi:10.1029/2006GL027193.

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