DOI: 10.1002/grl.50609
论文题名: Importance of mechanochemical effects on fault slip behavior during earthquakes
作者: Hirono T. ; Tanikawa W. ; Honda G. ; Kameda J. ; Fukuda J.-I. ; Ishikawa T.
刊名: Geophysical Research Letters
ISSN: 0094-8855
EISSN: 1944-8586
出版年: 2013
卷: 40, 期: 12 起始页码: 2988
结束页码: 2992
语种: 英语
英文关键词: fault physicochemistry
Scopus关键词: Dehydroxylation reactions
; Dehydroxylations
; Earthquake instability
; Experimental evidence
; Low temperatures
; Mechanochemical effects
; Mechanochemicals
; Physicochemical process
; Activation energy
; Fault slips
; Friction
; Earthquakes
; activation energy
; earthquake event
; fault slip
; friction
; illite
; plate boundary
; subduction zone
英文摘要: Recent analyses of natural faults and laboratory rock friction experiments have revealed that physical transformations and chemical reactions of minerals and fluids occur in faults during earthquakes. However, exactly how these physicochemical processes affect fault weakening and earthquake energetics is not well understood. We present quantitative experimental evidence of mechanochemical changes in a clay mineral (illite) during frictional slip and evaluate the effect of those changes on slip behavior. Friction distorts the crystal structure of illite and dramatically decreases the activation energy (Ea) of the dehydroxylation reaction. Numerical modeling shows that the lower Ea allows the dehydroxylation to occur at relatively low temperatures (200-300°C), which in turn drastically reduces fault strength by pressurization of released water from the mineral. Thus, dynamic thermo-chemo-mechanical processes can strongly affect earthquake instability, especially along clay-rich faults such as those in the shallow part of subduction zone plate boundaries. Key Points Mechanochemical effects govern fault slip behavior during earthquakes ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880561036&doi=10.1002%2fgrl.50609&partnerID=40&md5=f08e37f5d3610067d6cf87fd2a0dec2f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6119
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Space Science, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka 560-0043, Osaka, Japan
Recommended Citation:
Hirono T.,Tanikawa W.,Honda G.,et al. Importance of mechanochemical effects on fault slip behavior during earthquakes[J]. Geophysical Research Letters,2013-01-01,40(12).