Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy
On April 25, 2015, a destructive MW 7.8 earthquake struck the capital of Nepal, Kathmandu, killing more than 8800 people and destroying numerous historical structures. We analyze six coseismic interferograms from several satellites (ALOS-2, Sentinel-1 A, and RADARSAT-2), as well as three-dimensional...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2016
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| Online Access: | https://hdl.handle.net/10356/83399 http://hdl.handle.net/10220/41412 |
| _version_ | 1826126769751588864 |
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| author | Feng, Wanpeng Lindsey, Eric Barbot, Sylvain Samsonov, Sergey Dai, Keren Li, Peng Li, Zhenhong Almeida, Rafael Chen, Jiajun Xu, Xiaohua |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Feng, Wanpeng Lindsey, Eric Barbot, Sylvain Samsonov, Sergey Dai, Keren Li, Peng Li, Zhenhong Almeida, Rafael Chen, Jiajun Xu, Xiaohua |
| author_sort | Feng, Wanpeng |
| collection | NTU |
| description | On April 25, 2015, a destructive MW 7.8 earthquake struck the capital of Nepal, Kathmandu, killing more than 8800 people and destroying numerous historical structures. We analyze six coseismic interferograms from several satellites (ALOS-2, Sentinel-1 A, and RADARSAT-2), as well as three-dimensional displacements at six GPS stations to investigate fault structure and slip distribution of the Gorkha earthquake. Using a layered crustal structure, the best-fit slip model shows that the preferred dip angle of the mainshock fault is 6 ± 3.5° and the major slip is concentrated within depths of 8–15 km. The maximum slip of ~ 6.0 m occurs at a depth of 11 km, 70 km south east of the epicenter. The coseismic rupture extends ~ 150 km eastward of the epicentre with a cumulative geodetic moment of 7.8 × 1020 Nm, equivalent to an earthquake of MW 7.84. We also investigate the MW 7.2 aftershock on 12 May 2015 using another three postseismic interferograms from ALOS2, RADARSAT-2, and Sentinel-1 A. The InSAR-based best-fit slip model of the largest aftershock implies that its major slip is next to the eastern lower end of the mainshock rupture with a similar maximum slip of ~ 6 m at a depth of ~ 13 km. This study generates various coseismic geodetic measurements to determine the source parameters of the MW 7.8 Gorkha earthquake and 12 May MW 7.2 afershock, providing an additional chance to understand the local fault structure and slip extent. |
| first_indexed | 2024-10-01T06:58:05Z |
| format | Journal Article |
| id | ntu-10356/83399 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:58:05Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/833992020-03-07T12:45:22Z Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy Feng, Wanpeng Lindsey, Eric Barbot, Sylvain Samsonov, Sergey Dai, Keren Li, Peng Li, Zhenhong Almeida, Rafael Chen, Jiajun Xu, Xiaohua Earth Observatory of Singapore Gorkha earthquake ALOS2 On April 25, 2015, a destructive MW 7.8 earthquake struck the capital of Nepal, Kathmandu, killing more than 8800 people and destroying numerous historical structures. We analyze six coseismic interferograms from several satellites (ALOS-2, Sentinel-1 A, and RADARSAT-2), as well as three-dimensional displacements at six GPS stations to investigate fault structure and slip distribution of the Gorkha earthquake. Using a layered crustal structure, the best-fit slip model shows that the preferred dip angle of the mainshock fault is 6 ± 3.5° and the major slip is concentrated within depths of 8–15 km. The maximum slip of ~ 6.0 m occurs at a depth of 11 km, 70 km south east of the epicenter. The coseismic rupture extends ~ 150 km eastward of the epicentre with a cumulative geodetic moment of 7.8 × 1020 Nm, equivalent to an earthquake of MW 7.84. We also investigate the MW 7.2 aftershock on 12 May 2015 using another three postseismic interferograms from ALOS2, RADARSAT-2, and Sentinel-1 A. The InSAR-based best-fit slip model of the largest aftershock implies that its major slip is next to the eastern lower end of the mainshock rupture with a similar maximum slip of ~ 6 m at a depth of ~ 13 km. This study generates various coseismic geodetic measurements to determine the source parameters of the MW 7.8 Gorkha earthquake and 12 May MW 7.2 afershock, providing an additional chance to understand the local fault structure and slip extent. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2016-09-02T04:33:40Z 2019-12-06T15:21:36Z 2016-09-02T04:33:40Z 2019-12-06T15:21:36Z 2016 Journal Article Feng, W., Lindsey, E., Barbot, S., Samsonov, S., Dai, K., Li, P., et al. (2016). Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy. Tectonophysics, in press. 0040-1951 https://hdl.handle.net/10356/83399 http://hdl.handle.net/10220/41412 10.1016/j.tecto.2016.02.029 en Tectonophysics © 2016 Elsevier. |
| spellingShingle | Gorkha earthquake ALOS2 Feng, Wanpeng Lindsey, Eric Barbot, Sylvain Samsonov, Sergey Dai, Keren Li, Peng Li, Zhenhong Almeida, Rafael Chen, Jiajun Xu, Xiaohua Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy |
| title | Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy |
| title_full | Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy |
| title_fullStr | Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy |
| title_full_unstemmed | Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy |
| title_short | Source characteristics of the 2015 MW 7.8 Gorkha (Nepal) earthquake and its MW 7.2 aftershock from space geodesy |
| title_sort | source characteristics of the 2015 mw 7 8 gorkha nepal earthquake and its mw 7 2 aftershock from space geodesy |
| topic | Gorkha earthquake ALOS2 |
| url | https://hdl.handle.net/10356/83399 http://hdl.handle.net/10220/41412 |
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