DOI: 10.1002/2016GL067671
论文题名: High-velocity frictional strength across the Tohoku-Oki megathrust determined from surface drilling torque
作者: Ujiie K. ; Inoue T. ; Ishiwata J.
刊名: Geophysical Research Letters
ISSN: 0094-9194
EISSN: 1944-8925
出版年: 2016
卷: 43, 期: 6 起始页码: 2488
结束页码: 2493
语种: 英语
英文关键词: drilling torque
; frictional strength
; Japan Trench
; Tohoku-Oki earthquake
Scopus关键词: Earthquakes
; Friction
; Geophysics
; Sedimentary rocks
; Torque
; Tribology
; Velocity
; 2011 Tohoku-Oki earthquakes
; Drilling projects
; Drilling torques
; Friction coefficients
; Friction experiments
; Frictional strength
; Surface drilling
; Tohoku-Oki earthquakes
; Faulting
; drilling
; earthquake event
; fault displacement
; footwall
; friction
; hanging wall
; plate boundary
; slip rate
; strength
; thrust
; Tohoku earthquake 2011
; torque
; Honshu
; Japan
; Japan Trench
; Pacific Ocean
; Tohoku
英文摘要: High-velocity frictional strength is one of the primary factors controlling earthquake faulting. The Japan Trench Fast Drilling Project drilled through the shallow plate boundary fault, where displacement was ∼50 m during the 2011 Tohoku-Oki earthquake. To determine downhole frictional strength, we analyzed the surface drilling torque data acquired at rotation rates equivalent to seismic slip rates (0.8-1.3 m/s). The results show a clear contrast in high-velocity frictional strength across the plate boundary fault: the apparent friction coefficient of frontal prism sediments (hemipelagic mudstones) in the hanging wall is 0.1-0.3, while that of the underthrust sediments (mudstone, laminar pelagic claystone, and chert) in the footwall increases to 0.2-0.4. The apparent friction coefficient of the smectite-rich pelagic clay in the plate boundary fault is 0.08-0.19, which is consistent with that determined from high-velocity (1.1-1.3 m/s) friction experiments. This suggests that surface drilling torque is useful in obtaining downhole frictional strength. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977950269&doi=10.1002%2f2016GL067671&partnerID=40&md5=f9798b6c6b74c50df3cfb695158f7cfa
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10157
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: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
Recommended Citation:
Ujiie K.,Inoue T.,Ishiwata J.. High-velocity frictional strength across the Tohoku-Oki megathrust determined from surface drilling torque[J]. Geophysical Research Letters,2016-01-01,43(6).