DOI: 10.1016/j.tecto.2021.228852
论文题名: Rupture directivity of the 25 November 2018 Taiwan Strait Mw5.8 earthquake and its tectonic implications
作者: Wang S. ; Zeng X. ; Xu M. ; Zhang Y. ; Zhou Y. ; Wei X. ; Lin X.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 809 语种: 英语
中文关键词: Earthquake relocation
; Rupture directivity
; Seismogenic fault
; Taiwan Strait
; Waveform inversion
英文关键词: Faulting
; Waveform analysis
; Azimuthal variations
; Rupture directivity
; Seismogenic faults
; Seismogenic structures
; Strike-slip events
; Strong earthquakes
; Tectonic implications
; Waveform inversion
; Earthquakes
; active fault
; data inversion
; earthquake magnitude
; earthquake mechanism
; earthquake rupture
; fault zone
; seismic data
; seismicity
; strike-slip fault
; tectonic setting
; travel time
; waveform analysis
; China
; South China Block
; Taiwan Strait
英文摘要: Taiwan Strait is located between the actively deforming Taiwan Island and stable South China Craton. While strong earthquakes have occurred on the east and west sides of the Taiwan Strait and their seismotectonic are relatively well understood, the earthquake risk and seismogenic structure in the strait still need more investigations. On November 25, 2018, a rare moderately strong earthquake with a magnitude of Mw5.8 occurred inside the strait, and it caused broad ground motions in the near regions. From the waveform inversion of the seismic data, this earthquake is found to be a high-dip angle strike-slip event, with the two nodal planes striking east-west (EW) and north-south (NS) directions. As there are mapped faults striking EW and NS in the epicentral region, further studies are needed to determine the ruptured fault plane. To determine the ruptured fault plane, we analyzed the rupture directivity of the mainshock with the relative location between the hypocenter and the centroid. We chose several M4+ aftershocks as reference events and relocated the reference earthquakes with the Pn travel time difference. Then, we used regional waveform data to invert centroid location and source parameters of earthquakes. Thereafter, we estimated the strike of the mainshock ruptured fault and rupture length, via fitting the azimuthal variation of the Love wave time shift difference between the mainshock and the reference earthquakes. Our results showed that the mainshock ruptured along NS strike with the rupture length about 3.6–5.6 km. Combined with the tectonics, we inferred that the seismogenic fault is the Dongshan uplift eastern fault (DSEF) and the 1994 event may promote the occurrence of the 2018 Mw5.8 earthquake. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170919
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430077, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China; Southern Marine Science and Engineering, Guangdong Laboratory, Guangzhou, 511458, China; China Earthquake Networks Center, Beijing, 100045, China
Recommended Citation:
Wang S.,Zeng X.,Xu M.,et al. Rupture directivity of the 25 November 2018 Taiwan Strait Mw5.8 earthquake and its tectonic implications[J]. Tectonophysics,2021-01-01,809