Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake |
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Authors: | Mahdi Motagh Jürgen Klotz Farokh Tavakoli Yahya Djamour Siavash Arabi Hans-Ulrich Wetzel Jochen Zschau |
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Institution: | (1) GeoForschungsZentrum Potsdam (GFZ), Telegrafenberg, D-14473 Potsdam, Germany;(2) Laboratoire de Geophysique Interne et Tectonophysique, Maison des Geosciences, BP 53, 38041 Grenoble Cedex 9, France;(3) National Cartographic Center of Iran (NCC), Azadi Square, Meraj Avenue, P.O.Box: 13185–1684, Tehran, Iran |
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Abstract: | We used new precise leveling data acquired 40 days after the Bam earthquake in combination with radar interferometry observations
from both ascending and descending orbits to investigate static deformation associated with the 2003 Bam earthquake. We invert
this geodetic data set to gain insight into the fault geometry and slip distribution of the rupture. The best-fitting dislocation
model is a steeply east-dipping right-lateral strike-slip fault that has a size of 11 by 8 km and strikes N2°W. We find that
such smooth geometry fits available geodetic data better than previously proposed models for this earthquake. Our distributed
slip model indicates a maximum strike slip of 3 m occurring about 3 to 5 km deep. The slip magnitude and depth of faulting
taper to the north, where the fault approaches the Bam city. Inclusion of crustal layering increases the amount of maximum
slip inferred at depth by about 4%. |
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Keywords: | InSAR leveling |
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