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Post-Seismic to Co-Seismic Moment Ratios for the 2016 Moderate Earthquakes Along Chaman Fault
| Title: | Post-Seismic to Co-Seismic Moment Ratios for the 2016 Moderate Earthquakes Along Chaman Fault |
| Authors: | Furuya, Masato Browse this author →KAKEN DB | | Matsumoto, Fumiko Browse this author |
| Keywords: | Chaman fault | | InSAR | | afterslip | | rate-and-state friction | | time-dependent inversion |
| Issue Date: | 16-Jan-2022 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical research letters |
| Volume: | 49 |
| Issue: | 1 |
| Start Page: | e2021GL095236 |
| Publisher DOI: | 10.1029/2021GL095236 |
| Abstract: | Postseismic-to-coseismic moment ratios (PCMR) for strong (M > 6) earthquakes typically do not exceed similar to 0.3, but there have been limited estimates for moderate-to-small earthquakes. Three M5-class earthquakes and one M4.7 earthquake occurred along the Chaman fault, Pakistan, on May 13 and July 10, 2016. Using Sentinel-1A InSAR time-series from October 2014 to August 2018, we estimate spatial-temporal evolution of the co- and post-seismic fault slip and its velocity. Because of the long-lasting (>1 year) afterslip, the estimated PCMRs of the M5-class events and M4.7 event were 0.7 +/- 0.2 and 8.3 +/- 2.2, respectively, which are both larger than those of M > 6 earthquakes but consistent with previous events that occurred on the Chaman Fault System. Unlike in case of large earthquakes, geodetic inversions are not able to resolve spatial relationships between coseismic slip and afterslip. In case of a non-complementary slip distribution, one explanation might be heterogeneity of friction properties on the fault surface, while other interpretations are possible. |
| Rights: | Copyright 2021 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86321 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 古屋 正人
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