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| Content Provider | Springer Nature : SpringerOpen |
|---|---|
| Author | Kobayashi, Tomokazu Morishita, Yu Yarai, Hiroshi |
| Abstract | We have successfully detected widely distributed ground displacements for the 2015 Gorkha earthquake by applying a ScanSAR-based interferometry analysis of Advanced Land Observing Satellite 2 (ALOS-2) L-band data. A major displacement area extends with a length of about 160 km in the east-west direction, and the most concentrated crustal deformation with ground displacement exceeding 1 m is located 20–30 km east from Kathmandu. A quasi-vertical displacement estimated by combining the ascending and the descending data indicates upheaval of about 1.4 m at maximum. We inverted the synthetic aperture radar interferometry (InSAR) data including both of the main shock (moment magnitude (Mw) 7.8) and the largest aftershock (Mw 7.3) to construct a slip distribution model. Our model shows a nearly pure reverse fault motion with a slip amount of approximately 6 m at maximum, and the spatial extent is zonally distributed within a distance of 50 to 100 km from the surface along downdip direction. The downdip end of the slip is quite consistent with that of the interseismic coupling area geodetically inferred in previous studies. On the other hand, there is no significant slip at shallow depth in spite of the fact that the plate interface is thought to be fully locked there, may be suggesting that there still remains a potential of fault slip. The slip distribution unnaturally bifurcates in the east, and we can identify a clear-cut slip deficit area with a radius of ~10 km just west side of the Mw 7.3 event, where the slip amount reaches only 20 cm at most. This area is presumably subjected to a strong shear stress which should promote a reverse fault slip. There is a possibility to produce a fault slip equivalent to Mw ~7.0 in the future although we do not know if the slip heterogeneity would be smoothed out by a seismic event or an aseismic event. |
| Related Links | https://earth-planets-space.springeropen.com/counter/pdf/10.1186/s40623-015-0359-z |
| Ending Page | 13 |
| Page Count | 13 |
| Starting Page | 1 |
| ISSN | 18805981 |
| DOI | 10.1186/s40623-015-0359-z |
| Journal | Earth, Planets and Space |
| Issue Number | 1 |
| Volume Number | 67 |
| Language | English |
| Publisher | SpringerOpen |
| Publisher Date | 2015-12-14 |
| Access Restriction | Open |
| Subject Keyword | ALOS-2 InSAR ScanSAR Crustal deformation Gorkha earthquake Nepal Slip distribution Slip deficit |
| Content Type | Text |
| Resource Type | Article |
| Subject | Geology Space and Planetary Science |
| Aim | Earth, Planets and Space is dedicated to advancing scientific research in the Earth and Planetary Sciences by publishing the latest and most significant studies from around the world. It facilitates the rapid dissemination of high-quality research results through a peer-reviewed, open-access e-journal. The journal welcomes research papers and reviews in the following disciplines: geomagnetism aeronomy space science seismology volcanology geodesy planetary science Articles on emerging and interdisciplinary topics, including those addressing new instrumentation, are also encouraged. Earth, Planets and Space further provides a venue for topical special issues based on conferences, research projects, and other scientific initiatives. The journal offers a variety of publishing formats, including Full Papers, Express Letters, Frontier Letters, Technical Reports, and Comments. In all categories, only novel and original contributions will be considered for publication. Express Letters enable authors to rapidly publish brief reports of high-impact results. Frontier Letters feature cutting-edge research in diverse fields of the Earth and Planetary Sciences and are accepted by invitation of the Editor-in-Chief. Technical Reports highlight methodological and technical aspects of research in related fields. |
| Journal Impact Factor | 2.5/2024 |
| 5-Year Journal Impact Factor | 2.8/2024 |
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