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Co- and post-seismic Deformation Mechanisms of the MW 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations

1
College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
2
China Institute of Geo-Environment Monitoring, Beijing 100081, China
*
Authors to whom correspondence should be addressed.
Remote Sens. 2019, 11(4), 418; https://doi.org/10.3390/rs11040418
Received: 28 December 2018 / Revised: 1 February 2019 / Accepted: 14 February 2019 / Published: 18 February 2019
(This article belongs to the Special Issue Remote Sensing of Tectonic Deformation)
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Abstract

The extraction of high-accuracy co- and post-seismic deformation fields and inversions of seismic slip distributions is significant in the comprehension of seismogenic mechanisms. On 12 November 2017, a MW 7.3 earthquake occurred on the border between Iran and Iraq. To construct the co-seismic deformation field, Sentinel-1A synthetic aperture radar (SAR) images from three tracks were used. Based on a prior knowledge, least-squares iterative approximation was employed to construct the three-dimensional (3D) co-seismic deformation field. to derive a time series of 2D post-seismic deformation, the multidimensional small baseline subset (MSBAS) technique was use. Co-seismic deformation fields were asymmetric; the maximum relative displacement was nearly 90cm in the radar line-of-sight between two centers of co-seismic deformation. The 3D co-seismic deformation field showed southwestward horizontal motion and continuous subsidence-to-uplift variation from northeast to southwest. The two-dimensional (2D) post-seismic deformation time series showed a gradual decaying trend and good correspondence with the aftershock distribution. The main mechanism of post-seismic deformation was an afterslip of the post-seismic faults. We used the elastic half-space model to invert co-seismic deformation fields and obtain source parameters of the slip model. The maximum and average slips were 2.5 and 0.72 m, respectively. The average slip angle was 126.38° and the moment magnitude was MW 7.34. The results of this study will contribute to research on regional tectonic activities. View Full-Text
Keywords: Iran earthquake; Sentinel-1A; multidimensional small baseline subset (MSBAS); co-seismic deformation; 2D post-seismic deformation Iran earthquake; Sentinel-1A; multidimensional small baseline subset (MSBAS); co-seismic deformation; 2D post-seismic deformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yang, C.; Han, B.; Zhao, C.; Du, J.; Zhang, D.; Zhu, S. Co- and post-seismic Deformation Mechanisms of the MW 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations. Remote Sens. 2019, 11, 418.

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