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DOI | 10.1029/2020GL090806 |
Rupture of the 2020 MW 7.8 earthquake in the Shumagin gap inferred from seismic and geodetic observations | |
Chengli Liu; Thorne Lay; Xiong Xiong; Yangmao Wen | |
2020-10-29 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | The eastern portion of the Shumagin gap along the Alaska Peninsula ruptured in an MW 7.8 thrust earthquake on 22 July 2020. The megathrust fault space‐time slip history is determined by joint inversion of regional and teleseismic waveform data along with co‐seismic static GNSS displacements. The rupture expanded westward and along‐dip from the hypocenter, located adjacent to the 1938 MW 8.2 Alaska earthquake, with slip and aftershocks extending into the gap about 180 to 205 km, respectively, at depths from 15 to 40 km. The deeper half of ~75% of the Shumagin gap experienced faulting. However, the patchy slip is significantly less than possible accumulated slip since the region’s last major rupture in 1917, compatible with geodetic seismic‐coupling estimates of 10‐40% beneath the Shumagin Islands. The rupture terminated in the western region of very low seismic coupling. There was a regional decade‐scale decrease in b‐value prior to the 2020 event. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/301831 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Chengli Liu,Thorne Lay,Xiong Xiong,et al. Rupture of the 2020 MW 7.8 earthquake in the Shumagin gap inferred from seismic and geodetic observations[J]. Geophysical Research Letters,2020. |
APA | Chengli Liu,Thorne Lay,Xiong Xiong,&Yangmao Wen.(2020).Rupture of the 2020 MW 7.8 earthquake in the Shumagin gap inferred from seismic and geodetic observations.Geophysical Research Letters. |
MLA | Chengli Liu,et al."Rupture of the 2020 MW 7.8 earthquake in the Shumagin gap inferred from seismic and geodetic observations".Geophysical Research Letters (2020). |
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