DOI: 10.1002/grl.50223
论文题名: Segmentation of the Vp/Vs ratio and low-frequency earthquake distribution around the fault boundary of the Tonankai and Nankai earthquakes
作者: Akuhara T. ; Mochizuki K. ; Nakahigashi K. ; Yamada T. ; Shinohara M. ; Sakai S. ; Kanazawa T. ; Uehira K. ; Shimizu H.
刊名: Geophysical Research Letters
ISSN: 0094-9193
EISSN: 1944-8924
出版年: 2013
卷: 40, 期: 7 起始页码: 1306
结束页码: 1310
语种: 英语
英文关键词: LFE
; OBS
; subduction zone
; tomography
Scopus关键词: LFE
; Low-frequency earthquakes
; OBS
; Ocean bottom seismometer
; Pore fluid pressure
; Spatial relationships
; Subduction zones
; Velocity structure
; Tectonics
; Tomography
; Earthquakes
; arrival time
; earthquake event
; fault
; fluid pressure
; pore pressure
; seismograph
; slip
; subduction zone
; tomography
; velocity structure
; Honshu
; Japan
; Kii Peninsula
; Kinki
; Nankai Trough
; Pacific Ocean
英文摘要: Beneath the Kii Peninsula, the distribution of low-frequency earthquakes (LFEs) forms three clusters. A previous study shows that one of the clusters has anomalously less amount of cumulative slip than the others. To understand the cause of this variation, we applied a tomographic analysis using arrival times of earthquakes recorded by both ocean bottom seismometers and onshore stations. As a result, we identified segmentation about the Vp/Vs ratio around the subducting plate interface corresponding to the distribution of LFEs. One of the segments has low a Vp/Vs ratio that coincides with the small-slip LFE cluster. Another segment has a high Vp/Vs ratio in which almost no LFEs occur. We conclude that the relatively low pore fluid pressure within the low Vp/Vs segment contributes to the small-slip LFE cluster and that the gap of LFEs within the high Vp/Vs segment corresponds to stable slip area due to high pore fluid pressure. Key Points Segmentation of Vp/Vs ratio along subduction margin Spatial relationship between Vp/Vs ratio 3-D velocity structure from offshore to onshore around the Kii Peninsula ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876919079&doi=10.1002%2fgrl.50223&partnerID=40&md5=41982c671515ff78db99c78c7e0ccc2a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6457
Appears in Collections: 气候减缓与适应
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作者单位: Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
Recommended Citation:
Akuhara T.,Mochizuki K.,Nakahigashi K.,et al. Segmentation of the Vp/Vs ratio and low-frequency earthquake distribution around the fault boundary of the Tonankai and Nankai earthquakes[J]. Geophysical Research Letters,2013-01-01,40(7).