DOI: 10.1002/2013GL058109
论文题名: Seismic evidence for thermal runaway during intermediate-depth earthquake rupture
作者: Prieto G.A. ; Florez M. ; Barrett S.A. ; Beroza G.C. ; Pedraza P. ; Blanco J.F. ; Poveda E.
刊名: Geophysical Research Letters
ISSN: 0094-8342
EISSN: 1944-8073
出版年: 2013
卷: 40, 期: 23 起始页码: 6064
结束页码: 6068
语种: 英语
英文关键词: earthquake
; efficiency
; fracture energy
; intermediate depth
; source scaling
; thermal runaway
Scopus关键词: Dehydration embrittlements
; Intermediate depths
; Intermediate-depth earthquakes
; Physical mechanism
; Shallow earthquakes
; source scaling
; Temperature increase
; Thermal runaways
; Directive antennas
; Drops
; Efficiency
; Fracture energy
; Earthquakes
; earthquake rupture
; energy efficiency
; failure mechanism
; fracture
; heating
; intermediate water
; pressure effect
; seismic anisotropy
; temperature effect
; Bucaramanga
; Colombia
; Santander [Colombia]
英文摘要: Intermediate-depth earthquakes occur at depths where temperatures and pressures exceed those at which brittle failure is expected. There are two leading candidates for the physical mechanism behind these earthquakes: dehydration embrittlement and self-localizing thermal shear runaway. A complete energy budget for a range of earthquake sizes can help constrain whether either of these mechanisms might play a role in intermediate-depth earthquake rupture. The combination of high stress drop and low radiation efficiency that we observe for Mw 4-5 earthquakes in the Bucaramanga Nest implies a temperature increase of 600-1000°C for a centimeter-scale layer during earthquake failure. This suggests that substantial shear heating, and possibly partial melting, occurs during intermediate-depth earthquake failure. Our observations support thermal shear runaway as the mechanism for intermediate-depth earthquakes, which would help explain differences in their behavior compared to shallow earthquakes. Key Points Evidence for thermal shear runaway mechanism for intermediate-depth earthquakes Stress drop scaling and low radiation efficiencies observed for Mw 3.5-5.2 Fracture energies larger than for shallow earthquakes with similar slip ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84889064753&doi=10.1002%2f2013GL058109&partnerID=40&md5=ecaabcf12c5eb74df33bbc7d152306a2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5606
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, United States
Recommended Citation:
Prieto G.A.,Florez M.,Barrett S.A.,et al. Seismic evidence for thermal runaway during intermediate-depth earthquake rupture[J]. Geophysical Research Letters,2013-01-01,40(23).