DOI: 10.1002/2015GL063140
论文题名: Changes in seismicity before and after the 2011 Tohoku earthquake around its southern limit revealed by dense ocean bottom seismic array data
作者: Nakatani Y. ; Mochizuki K. ; Shinohara M. ; Yamada T. ; Hino R. ; Ito Y. ; Murai Y. ; Sato T.
刊名: Geophysical Research Letters
ISSN: 0094-8917
EISSN: 1944-8648
出版年: 2015
卷: 42, 期: 5 起始页码: 1384
结束页码: 1389
语种: 英语
英文关键词: backprojection
; OBS
; seismicity
; subducting seamount
; the 2011 Tohoku earthquake
Scopus关键词: Seismology
; 2011 tohoku earthquakes
; Back-projection
; OBS
; Seismicity
; Subducting seamount
; Earthquakes
; aftershock
; coseismic process
; seamount
; seismic data
; seismicity
; subduction zone
; Tohoku earthquake 2011
; Honshu
; Ibaraki
; Japan
; Kanto
英文摘要: The southern limit of the 2011 Tohoku earthquake is considered to be located around off Ibaraki. However, it is not well constrained how far south the large slip extended. To give better constraints, we investigated seismicity including small earthquakes before and after the Tohoku earthquake around off Ibaraki using dense ocean bottom seismic array data. We automatically identified epicenters by backprojecting semblance values resulting in a considerable increase in the number of detected events compared with those listed in the catalog based on onshore observation. The results revealed a couple of seismicity-activated region. The largest aftershock also occurred ~30 min after the main shock. Our detailed results suggest that this highly activated seismicity was initiated by the largest aftershock instead of the main shock. It, then, suggests that the large coseismic slip zone of the Tohoku earthquake may not have extended off Ibaraki. © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925878450&doi=10.1002%2f2015GL063140&partnerID=40&md5=cf7f8a491087a41615f97ce6b67c511c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8533
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:
Nakatani Y.,Mochizuki K.,Shinohara M.,et al. Changes in seismicity before and after the 2011 Tohoku earthquake around its southern limit revealed by dense ocean bottom seismic array data[J]. Geophysical Research Letters,2015-01-01,42(5).