DOI: 10.1002/2014GL062002
论文题名: Structural control on the nucleation of megathrust earthquakes in the Nankai subduction zone
作者: Liu X. ; Zhao D.
刊名: Geophysical Research Letters
ISSN: 0094-9502
EISSN: 1944-9233
出版年: 2014
卷: 41, 期: 23 起始页码: 8288
结束页码: 8293
语种: 英语
英文关键词: megathrust earthquakes
; Nankai subduction zone
; seafloor topography
; seismic tomography
; structural heterogeneity
Scopus关键词: Nucleation
; Seismographs
; Shear waves
; Structural dynamics
; Tectonics
; Megathrust earthquakes
; Nankai subduction zone
; Sea floor
; Seismic tomography
; Structural heterogeneity
; Earthquakes
; bottom topography
; earthquake event
; heterogeneity
; nucleation
; seafloor
; seismic wave
; subduction zone
; wave attenuation
; wave velocity
; China
; Japan
; Nankai
; Tianjin
英文摘要: To clarify the causal mechanisms of megathrust earthquakes, we studied the detailed three-dimensional P and S wave velocities (V), attenuation (Q), and Poisson's ratio (σ) structures of the Nankai subduction zone in southwest Japan, using a large number of high-quality arrival time and t∗ data measured precisely from seismograms of local earthquakes. The suboceanic earthquakes used are relocated precisely using sP depth phase and ocean bottom seismometer data. Our results show the existence of two prominent high-V, high-Q, and low-σ patches separated by low-V, low-Q, and high-σ anomalies in the Nankai megathrust zone. Megathrust earthquakes during 1900 to 2013 nucleated in or around the high-V, high-Q, and low-σ patches, which may represent strongly coupled areas (i.e., asperities) in the megathrust zone. Our results indicate that structural heterogeneities in the megathrust zone, such as the subducting seafloor topography and compositional variations, control the nucleation of the Nankai megathrust earthquakes. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921604050&doi=10.1002%2f2014GL062002&partnerID=40&md5=fe9113c3ae6cfefe72380d8e224592b8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6766
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geophysics, Tohoku University, Sendai, Japan
Recommended Citation:
Liu X.,Zhao D.. Structural control on the nucleation of megathrust earthquakes in the Nankai subduction zone[J]. Geophysical Research Letters,2014-01-01,41(23).