DOI: 10.1002/2015GL063230
论文题名: SAHKE seismic-scatter imaging of subduction beneath Wellington, North Island, New Zealand
作者: Kurashimo E. ; Henrys S. ; Sato H. ; Iwasaki T. ; Okaya D. ; Sutherland R. ; Stern T. ; Iidaka T. ; Ishiyama T. ; Savage M.
刊名: Geophysical Research Letters
ISSN: 0094-9379
EISSN: 1944-9110
出版年: 2015
卷: 42, 期: 9 起始页码: 3240
结束页码: 3247
语种: 英语
英文关键词: fault slip behavior
; Hikurangi margin
; scattering image
; splay fault
; subducting slab
; Wairarapa Fault
Scopus关键词: Locks (fasteners)
; Seismology
; Strike-slip faults
; Structural geology
; Tectonics
; Hikurangi margin
; Local material properties
; Pore fluid pressure
; Reflectivity analysis
; Scattering image
; Slip behavior
; Subducting slabs
; Subduction interface
; Fault slips
; fault zone
; fluid pressure
; geodesy
; interface
; plate tectonics
; seismic wave
; subduction
; New Zealand
; North Island
; Wellington [North Island]
英文摘要: Scattering reflectivity analysis of onshore seismic data (Seismic Array HiKurangi Experiment) images slab geometry and crustal structure at a geodetically locked subduction boundary. A broad seismic scattering zone (BSZ) up to 10km thick above the subduction interface at depths of 16-30km has seismic properties (Vp , Vp /Vs , and Q) that imply high fluid pressures, probably associated with underplated sediments. The listric strike-slip Wairarapa Fault and other splay faults that sole into the BSZ imply long-term weakness. High rates of intraslab seismicity with low rates above the slab imply stress decoupling across the BSZ. Association of high fluid pressures and long-term weakness with geodetic locking is in contrast to similar observations at zones of slow slip at the northern Hikurangi margin and suggest that either (1) pore fluid pressure or locking behavior may cycle over times longer than two decades or (2) local material properties play a significant role in determining if slow slip or locking occurs. Key Points A broad scattering zone above the interface consistent with high fluid pressure Seismicity and listric strike-slip splay faults imply long-term weakness High fluid pressures and long-term weakness associated with geodetic locking ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930484148&doi=10.1002%2f2015GL063230&partnerID=40&md5=0afec2e4f47e11585600b527dd77faa9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8994
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: Earthquake Research Institute, University of Tokyo, Tokyo, Japan
Recommended Citation:
Kurashimo E.,Henrys S.,Sato H.,et al. SAHKE seismic-scatter imaging of subduction beneath Wellington, North Island, New Zealand[J]. Geophysical Research Letters,2015-01-01,42(9).