DOI: 10.1002/2015GL067381
论文题名: Coseismic radiation and stress drop during the 2015 Mw 8.3 Illapel, Chile megathrust earthquake
作者: Yin J. ; Yang H. ; Yao H. ; Weng H.
刊名: Geophysical Research Letters
ISSN: 0094-9332
EISSN: 1944-9063
出版年: 2016
卷: 43, 期: 4 起始页码: 1520
结束页码: 1528
语种: 英语
英文关键词: 2015 Chile earthquake
; coseismic radiation
; megathrust event
; stress drop
; subducted seamount
; subduction zone
Scopus关键词: Compressed sensing
; Drops
; Geophysics
; Radiation
; Tectonics
; Chile earthquakes
; Megathrust
; Stress drop
; Subducted seamount
; Subduction zones
; Earthquakes
英文摘要: On 16 September 2015, an Mw 8.3 earthquake struck middle Chile due to the subduction of the Nazca plate beneath the South America plate. This earthquake is the consequence of 72 years of strain accumulation in the region since the 1943 M 8.3 event. In this study, we apply the compressive sensing method (CS) to invert for the spatiotemporal distribution of the coseismic radiation at different frequencies of this event. The results show clear frequency-dependent feature of earthquake rupture with low-frequency (LF) radiation located in the updip region while high-frequency (HF) radiation concentrated in the downdip region of the megathrust. We also compare the CS results with three coseismic slip models as well as the stress drop distributions inferred from these slip models. The comparison confirms our understanding of coseismic radiation that energy sources are mostly located in the margin of large coseismic slip regions. Furthermore, we find that the LF radiation sources are mainly within the stress-decreasing (releasing) regions while the HF radiation sources are mainly located in the stress-increasing (loading) regions due to rupturing of relatively large asperities nearby (stress decreasing and releasing). These results help to better understand the physics of the rupture process during megathrust earthquakes. Moreover, our results do not show radiation sources south of the epicenter, suggesting that the subducting Juan Fernandez Ridge probably stopped the rupture of this earthquake toward the south. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959199160&doi=10.1002%2f2015GL067381&partnerID=40&md5=df2b7856eb19833ac7e41ff9b4ee6a47
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10295
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China
Recommended Citation:
Yin J.,Yang H.,Yao H.,et al. Coseismic radiation and stress drop during the 2015 Mw 8.3 Illapel, Chile megathrust earthquake[J]. Geophysical Research Letters,2016-01-01,43(4).