Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations
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 M<sub>W</sub> 7.3 earthquake occurred on the border between Iran and Iraq. To constru...
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MDPI AG
2019-02-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/11/4/418 |
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| author | Chengsheng Yang Bingquan Han Chaoying Zhao Jiantao Du Dongxiao Zhang Sainan Zhu |
| author_facet | Chengsheng Yang Bingquan Han Chaoying Zhao Jiantao Du Dongxiao Zhang Sainan Zhu |
| author_sort | Chengsheng Yang |
| collection | DOAJ |
| description | 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 M<sub>W</sub> 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 M<sub>W</sub> 7.34. The results of this study will contribute to research on regional tectonic activities. |
| first_indexed | 2024-04-11T16:02:02Z |
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| id | doaj.art-e5da0364d19a4776b1f9bd5d622fccad |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-04-11T16:02:02Z |
| publishDate | 2019-02-01 |
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| series | Remote Sensing |
| spelling | doaj.art-e5da0364d19a4776b1f9bd5d622fccad2022-12-22T04:14:57ZengMDPI AGRemote Sensing2072-42922019-02-0111441810.3390/rs11040418rs11040418Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR ObservationsChengsheng Yang0Bingquan Han1Chaoying Zhao2Jiantao Du3Dongxiao Zhang4Sainan Zhu5College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaChina Institute of Geo-Environment Monitoring, Beijing 100081, ChinaThe 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 M<sub>W</sub> 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 M<sub>W</sub> 7.34. The results of this study will contribute to research on regional tectonic activities.https://www.mdpi.com/2072-4292/11/4/418Iran earthquakeSentinel-1Amultidimensional small baseline subset (MSBAS)co-seismic deformation2D post-seismic deformation |
| spellingShingle | Chengsheng Yang Bingquan Han Chaoying Zhao Jiantao Du Dongxiao Zhang Sainan Zhu Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations Remote Sensing Iran earthquake Sentinel-1A multidimensional small baseline subset (MSBAS) co-seismic deformation 2D post-seismic deformation |
| title | Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations |
| title_full | Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations |
| title_fullStr | Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations |
| title_full_unstemmed | Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations |
| title_short | Co- and post-seismic Deformation Mechanisms of the M<sub>W</sub> 7.3 Iran Earthquake (2017) Revealed by Sentinel-1 InSAR Observations |
| title_sort | co and post seismic deformation mechanisms of the m sub w sub 7 3 iran earthquake 2017 revealed by sentinel 1 insar observations |
| topic | Iran earthquake Sentinel-1A multidimensional small baseline subset (MSBAS) co-seismic deformation 2D post-seismic deformation |
| url | https://www.mdpi.com/2072-4292/11/4/418 |
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