DOI: 10.1002/2015GL065975
论文题名: Investigation of coseismic and postseismic processes using in situ measurements of seismic velocity variations in an underground mine
作者: Olivier G. ; Brenguier F. ; Campillo M. ; Roux P. ; Shapiro N.M. ; Lynch R.
刊名: Geophysical Research Letters
ISSN: 0094-8528
EISSN: 1944-8259
出版年: 2015
卷: 42, 期: 21 起始页码: 9261
结束页码: 9269
语种: 英语
英文关键词: ambient seismic noise
; mining
; triggered earthquakes
; velocity variations
Scopus关键词: Explosives
; Geophysics
; Mining
; Rocks
; Seismic waves
; Seismology
; Stresses
; Velocity
; Ambient seismic noise
; Earthquake activity
; In-situ measurement
; Mechanical response
; Seismic velocities
; Short-term effects
; Triggered Earthquakes
; Velocity variations
; Earthquakes
; accuracy assessment
; aftershock
; ambient noise
; blasting
; coseismic process
; dynamic response
; earthquake trigger
; elasticity
; hard rock
; in situ measurement
; induced seismicity
; mining
; postseismic process
; rock mass response
; seismic noise
; seismic velocity
; seismic wave
; spatial analysis
; static response
; stress change
; subsidence
; underground construction
英文摘要: The in situ mechanical response of a rock mass to a sudden dynamic and static stress change is still poorly known. To tackle this question, we conducted an experiment in an underground mine to examine (1) the influence of dynamic and static stress perturbations on seismic velocities, (2) elastic static stress changes, and (3) induced earthquake activity associated with the blast and removal of a portion of hard rock. We accurately (0.01%) measured seismic velocity variations with ambient seismic noise correlations, located aftershock activity, and performed elastic static stress modeling. Overall, we observe that the blast induced a sudden decrease in seismic velocities over the entire studied area, which we interpreted as the damage due to the passing of strong seismic waves. This sudden process is followed by a slow relaxation lasting up to 5 days, while seismic activity returns to its background level after 2 days. In some locations, after the short-term effects of the blast have subsided, the seismic velocities converge to new baseline levels and permanent changes in seismic velocity become visible. After comparing the spatial pattern of permanent seismic velocity changes with elastic static stress modeling, we infer that the permanent seismic velocity changes are due to the change in the static volumetric stress induced by the removal of a solid portion of rock by the blast. To our knowledge, this is the first observation of noise-based permanent seismic velocity changes associated with static stress changes. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955187495&doi=10.1002%2f2015GL065975&partnerID=40&md5=8c2217f0c44f952f20c1a3cc89c9ba22
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8144
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: Institut des Sciences de la Terre, Université Joseph Fourier, Grenoble, France
Recommended Citation:
Olivier G.,Brenguier F.,Campillo M.,et al. Investigation of coseismic and postseismic processes using in situ measurements of seismic velocity variations in an underground mine[J]. Geophysical Research Letters,2015-01-01,42(21).