Poster #106, Tectonic Geodesy
Permanent Co-seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake from High-resolution Surface Strain Analysis
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Poster Presentation
2020 SCEC Annual Meeting, Poster #106, SCEC Contribution #10458 VIEW PDF
invert SPOT-5 and WorldView optical imagery pixel-tracking displacements for 30-m resolution co-seismic surface strain fields of the 2013 Mw7.7 Baluchistan, Pakistan strike-slip earthquake. We observe near-fault positive dilatation strains, indicative of co-seismic fault zone expansion. We define permanent fault zone width (PFZW) as the near-fault extent where strain magnitude exceeds the elastic yield limit for common rocks (~0.5%). We show that inelastic failure is localized within a zone of consistent 100-120 m width along the rupture trace. The PFZW does not show clear correlation to varing off-fault deformation or surficial material types. Instead, by comparing our results to those calculated from other recent earthquakes, we found that the PFZW is consistent with scaling relationships between fault maturity (as defined by cumulative offset) and damage zone width. Therefore, we argue that the observed permanent deformation zone reflects active deformation of the fault damage zone.
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