| DOI: | 10.1002/2015GL066096
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| 论文题名: | Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering |
| 作者: | Ferdowsi B.; Griffa M.; Guyer R.A.; Johnson P.A.; Marone C.; Carmeliet J.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8419
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| EISSN: | 1944-8150
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| 出版年: | 2015
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| 卷: | 42, 期:22 | | 起始页码: | 9750
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| 结束页码: | 9757
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| 语种: | 英语
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| 英文关键词: | dynamic earthquake triggering
; fault mechanics
; granular mechanics of fault gouge
; induced earthquake
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| Scopus关键词: | Clocks
; Dynamics
; Faulting
; Friction
; Geophysics
; Seismology
; Slip forming
; Stick-slip
; Discrete element method simulations
; Dynamic earthquake triggering
; Fault gouge
; Fault mechanics
; Transient vibrations
; Triggered Earthquakes
; Vibrational amplitudes
; Vibrational excitation
; Earthquakes
; acoustic method
; Coulomb criterion
; discrete element method
; earthquake trigger
; elastic modulus
; fault gouge
; friction
; granular medium
; induced seismicity
; seismic source
; shear
; stick-slip
; strain
; vibration
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| 英文摘要: | A fundamental mystery in earthquake physics is "how can an earthquake be triggered by distant seismic sources?" Here we use discrete element method simulations of a granular layer, during stick slip, that is subject to transient vibrational excitation to gain further insight into the physics of dynamic earthquake triggering. Using Coulomb friction law for grains interaction, we observe delayed triggering of slip in the granular gouge. We find that at a critical vibrational amplitude (strain) there is an abrupt transition from negligible time-advanced slip (clock advance) to full clock advance; i.e., transient vibration and triggered slip are simultaneous. The critical strain is of order 10-6, similar to observations in the laboratory and in Earth. The transition is related to frictional weakening of the granular layer due to a dramatic decrease in coordination number and the weakening of the contact force network. Associated with this frictional weakening is a pronounced decrease in the elastic modulus of the layer. The study has important implications for mechanisms of triggered earthquakes and induced seismic events and points out the underlying processes in response of the fault gouge to dynamic transient stresses. Key Points Clock advance of the triggered slip is a first-order phase transition of the vibration amplitude The critical vibrational strain for triggering clock-advanced slip is of order 10-6 The transition is due to weakening of the granular layer and disruption of its contact network. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956936357&doi=10.1002%2f2015GL066096&partnerID=40&md5=c115715ca372984155af80102db7007c
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8035
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| 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: | Department of Civil, Environmental and Geomatic Engineering, Swiss Federal Institute of Technology Zurich, ETH Zürich, Zürich, Switzerland
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| Recommended Citation: | |
Ferdowsi B.,Griffa M.,Guyer R.A.,et al. Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering[J]. Geophysical Research Letters,2015-01-01,42(22).
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