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Summary of Proposal GEO2125

TitleCo-seismic deformation associated with the 2013 Pakistan-Balochistan earthquake (M=7.7)
Investigator Grandin, Raphael - Institut de Physique du Globe de Paris, Equipe de Tectonique
Team Member
Dr. Bollinger, Laurent - CEA, Laboratoire Etudes Géophysiques et Aléas
Dr. Pinel-Puysségur, Béatrice - CEA, Laboratoire de Détection et de Géophysique
Dr. De Michele, Marcello - Bureau des Recherches Géologiques et Minières, N/A
Dr. Klinger, Yann - Institut de Physique du Globe de Paris, Equipe de Tectonique
Dr. Grandin, Raphael - Institut de Physique du Globe de Paris, Equipe de Tectonique et Mecanique de la Lithosphere
SummaryThe aim of the project is to map, using complementary remote sensing techniques, the full 3D displacement field associated with the 2013 Balochistan –Pakistan earthquake (September 24, 2013, Mw=7.7). These techniques include synthetic aperture radar interferometry using TerraSAR-X, along with high-resolution optical imaging of the surface rupture associated with the earthquake and sub-pixel correlation of high-resolution optical imagery. These data are expected to provide key insights into the near surface characteristics of the causative fault, including its geometry, the spatial variability of slip on the fault plane, and mechanical conditions that prevailed before and after the earthquake from the sub-surface down to the depth interval that likely contributed to the bulk of the strain release during the event.
The 2013 Balochistan earthquake, with a moment magnitude of 7.7, is the largest continental strike-slip earthquake to have occurred since the 2001 Kokoxili earthquake (M=7.8). The expected along-strike extent of the rupture (>100km) makes it possible to investigate the segmentation properties of the activated fault zone. Furthermore, a remote sensing study will provide invaluable information to document this earthquake, which occurred in a remote area with difficult access.
TerraSAR-X data will be processed with state-of-the-art InSAR methods to measure the deformation of the ground surface during the earthquake. Multiple Aperture InSAR (MAI) will also be computed to determine the horizontal along-track component of deformation. In a separate study, we will apply sub-pixel correlation techniques to available high-resolution optical imagery (Pléiades, provided by French Space Agency) in order to retrieve the full 3D displacement in the near field and precisely map the rupture. Resulting geodetic data will be interpreted and inverted using mechanical models of fault slip.
Funds required to cover data acquisition expenses have already been secured through a "young researcher grant" allocated to Dr. Grandin by University Paris 7.

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