DOI: 10.1002/2013GL058359
论文题名: Trench-parallel crustal anisotropy along the trench in the fore-arc region of Japan
作者: Iidaka T. ; Muto J. ; Obara K. ; Igarashi T. ; Shibazaki B.
刊名: Geophysical Research Letters
ISSN: 0094-10262
EISSN: 1944-9993
出版年: 2014
卷: 41, 期: 6 起始页码: 1957
结束页码: 1963
语种: 英语
英文关键词: shear-wave splitting
; subduction
Scopus关键词: Earthquakes
; Polarization
; Shear waves
; Stresses
; Crustal anisotropy
; Crustal earthquakes
; Earthquake cycles
; Lateral variations
; Linear viscoelasticity
; North american plates
; Shear wave splitting
; subduction
; Anisotropy
; backarc basin
; earthquake event
; extensional tectonics
; finite element method
; forearc basin
; island arc
; plate tectonics
; polarization
; S-wave
; seismic anisotropy
; stress field
; subduction
; trench
; viscoelasticity
; wave splitting
; Japan
; North America
; Pacific Ocean
英文摘要: In northeastern Japan, the Pacific plate is descending beneath the North American plate. It is generally understood that trench-normal principal stress is dominant in the crust along the Japanese island arc, because the stress field is controlled by the force of the subducting slab. Observations of shear wave splitting using crustal earthquakes reveal a marked lateral variation in fast-polarization direction with distance from the trench. Trench-normal and trench-parallel fast-polarization directions are observed on the back-arc and fore-arc sides, respectively. In this study, two-dimensional finite element modeling with subducting slab was conducted to investigate the interseismic stress field during earthquake cycles, taking into account linear viscoelasticity. In the model, trench-normal compression is found to dominate in the island arc region. However, an extensional field appears in the shallow upper crust of the fore-arc region during earthquake cycles. The trench-parallel crustal anisotropy can be explained by this extensional field. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896566867&doi=10.1002%2f2013GL058359&partnerID=40&md5=7e1e266124813639dabc58dbc36f5ab8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7526
Appears in Collections: 气候减缓与适应
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作者单位: Earthquake Research Institute, University of Tokyo, Tokyo, Japan
Recommended Citation:
Iidaka T.,Muto J.,Obara K.,et al. Trench-parallel crustal anisotropy along the trench in the fore-arc region of Japan[J]. Geophysical Research Letters,2014-01-01,41(6).