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GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L06304, doi:10.1029/2005GL025429, 2006

Static stress change from the 8 October, 2005 M = 7.6 Kashmir earthquake

Tom Parsons

U.S. Geological Survey, Menlo Park, California, USA


Robert S. Yeats

Department of Geosciences, Oregon State University, Corvallis, Oregon, USA


Yuji Yagi

Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan


Ahmad Hussain

Geological Survey of Pakistan, Peshawar City, Pakistan


Abstract

We calculated static stress changes from the devastating M = 7.6 earthquake that shook Kashmir on 8 October, 2005. We mapped Coulomb stress change on target fault planes oriented by assuming a regional compressional stress regime with greatest principal stress directed orthogonally to the mainshock strike. We tested calculation sensitivity by varying assumed stress orientations, target-fault friction, and depth. Our results showed no impact on the active Salt Range thrust southwest of the rupture. Active faults north of the Main Boundary thrust near Peshawar fall in a calculated stress-decreased zone, as does the Raikot fault zone to the northeast. We calculated increased stress near the rupture where most aftershocks occurred. The greatest increase to seismic hazard is in the Indus-Kohistan seismic zone near the Indus River northwest of the rupture termination, and southeast of the rupture termination near the Kashmir basin.

Received 7 December 2005; accepted 8 February 2006; published 21 March 2006.

Index Terms: 7215 Seismology: Earthquake source observations (1240); 7223 Seismology: Earthquake interaction, forecasting, and prediction (1217, 1242); 7230 Seismology: Seismicity and tectonics (1207, 1217, 1240, 1242); 8164 Tectonophysics: Stresses: crust and lithosphere.

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Citation: Parsons, T., R. S. Yeats, Y. Yagi, and A. Hussain (2006), Static stress change from the 8 October, 2005 M = 7.6 Kashmir earthquake, Geophys. Res. Lett., 33, L06304, doi:10.1029/2005GL025429.