DOI: 10.1002/grl.50364
论文题名: High-resolution seismic imaging in the Japan Trench axis area off Miyagi, northeastern Japan
作者: Nakamura Y. ; Kodaira S. ; Miura S. ; Regalla C. ; Takahashi N.
刊名: Geophysical Research Letters
ISSN: 0094-9112
EISSN: 1944-8843
出版年: 2013
卷: 40, 期: 9 起始页码: 1713
结束页码: 1718
语种: 英语
英文关键词: décollement
; imbricate structure
; Japan Trench
; Tohoku earthquake
Scopus关键词: High-resolution seismic datum
; Japan Trench
; Plate boundaries
; Plate boundary slips
; Sedimentary input
; Seismic imaging
; Structural frameworks
; Tohoku earthquakes
; Buildings
; Loading
; Sedimentology
; Seismic waves
; Earthquakes
; basement (building)
; chert
; decollement
; drilling
; frontal feature
; graben
; horst
; image resolution
; imaging method
; imbrication
; loading
; mudstone
; sedimentary structure
; seismic data
; slip
; subduction
; thrust
; Tohoku earthquake 2011
; topographic mapping
; trench
; Honshu
; Japan
; Japan Trench
; Miyagi
; Pacific Ocean
; Tohoku
英文摘要: Newly obtained high-resolution seismic data reveal the detailed structure of the Japan Trench axis off Miyagi, Japan, in the region of large shallow slip during the 11 March 2011 M9 Tohoku earthquake. Correlation of seismic images with previous drilling results identifies a possible basal chert-rich layer and hemipelagic/pelagic mudstones overlying igneous Pacific crust. Mapping of acoustic basement depicts the subduction of horst-and-graben topography. The basement and basal chert are subducted beneath a seismically chaotic frontal prism, but the majority of overlying hemipelagic mudstones is offscraped and imbricated at the trench axis as a result of plate boundary compression. A possible décollement is imaged as a seaward dipping reflection at landward part of the trench graben and was likely generated by loading and failure of underthrust sediments. Collectively, these analyses provide a structural framework for understanding sedimentary inputs and the localization of shallow plate boundary slip at the Japan Trench. Key Points Detailed structure in the Japan Trench axis is imaged with seismic dataDécollement and imbricate structure of sediments are clearly observedPossible scenario for the sequence of deformation in the trench is presented ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879119826&doi=10.1002%2fgrl.50364&partnerID=40&md5=3c4dcf699da70e2e612ec433e457ad8a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6376
Appears in Collections: 气候减缓与适应
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作者单位: Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
Recommended Citation:
Nakamura Y.,Kodaira S.,Miura S.,et al. High-resolution seismic imaging in the Japan Trench axis area off Miyagi, northeastern Japan[J]. Geophysical Research Letters,2013-01-01,40(9).