DOI: 10.1002/2013GL058374
论文题名: The influence of ambient fault temperature on flash-heating phenomena
作者: Passelègue F.X. ; Goldsby D.L. ; Fabbri O.
刊名: Geophysical Research Letters
ISSN: 0094-10396
EISSN: 1944-10127
出版年: 2014
卷: 41, 期: 3 起始页码: 828
结束页码: 835
语种: 英语
英文关键词: Fault temperature
; Flash heating
; Friction
Scopus关键词: Experiments
; Friction
; Seismographs
; Velocity
; Earthquake rupture
; Experimental investigations
; Flash heating
; Friction coefficients
; Frictional behavior
; Frictional heating
; High-velocity frictions
; Material parameter
; Heating
; earthquake rupture
; experimental study
; fault
; friction
; heating
; microscopy
; temperature effect
; velocity
英文摘要: Recent high-velocity friction experiments on room temperature rocks reveal a dramatic weakening caused by extreme frictional heating and thermal degradation of the strength of microscopic asperity contacts on a slip surface, i.e., "flash" heating. Here we explore the effects of elevated ambient fault temperature, up to that at the base of the Earth's seismogenic zone, on the flash-heating behavior of quartzite, Westerly granite, and India gabbro. The experiments demonstrate that elevated ambient fault temperature causes 1) an increase in the characteristic weakening velocity for flash heating, and 2) an increase in the friction coefficient at a given velocity above this characteristic weakening velocity. These unexpected results are reconciled with flash-heating theory when temperature-specific values of various material parameters are incorporated in existing constitutive descriptions of flash heating. Our results suggest that constitutive equations for flash heating can be extrapolated with confidence to the elevated ambient temperatures of the seismogenic zone. Key Points Experimental investigation of the effect of fault temperature on Flash heating Unexpected frictional behavior supported by theory adapted for high temperature Flash heating may play a second role in in the propagation of earthquake rupture ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893678709&doi=10.1002%2f2013GL058374&partnerID=40&md5=823c386329d3888afaee3c8d4c6441cf
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7660
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: CNRS UMR 8538, École Normale Supérieure, Paris, France
Recommended Citation:
Passelègue F.X.,Goldsby D.L.,Fabbri O.. The influence of ambient fault temperature on flash-heating phenomena[J]. Geophysical Research Letters,2014-01-01,41(3).