DOI: 10.1016/j.epsl.2018.08.042
Scopus记录号: 2-s2.0-85052908379
论文题名: Ambient seismic vibrations in steep bedrock permafrost used to infer variations of ice-fill in fractures
作者: Weber S. ; Fäh D. ; Beutel J. ; Faillettaz J. ; Gruber S. ; Vieli A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501 起始页码: 119
结束页码: 127
语种: 英语
英文关键词: ambient seismic vibration
; bedrock permafrost
; fracture displacement
Scopus关键词: Fracture
; Hysteresis
; Ice control
; Natural frequencies
; Permafrost
; Rocks
; Seismology
; Slope stability
; Fracture displacement
; Hysteretic behavior
; Low resonance frequency
; Repeated patterns
; Resonance frequencies
; Rock slope stability
; Seismic vibrations
; Temporal variation
; Ice
; bedrock
; displacement
; fracture mechanics
; permafrost
; seismic response
; slope stability
; vibration
英文摘要: The behavior of ice in frozen rock masses is an important control on rock slope stability but the knowledge of the formation, extent and evolution of ice-filled fractures in steep bedrock permafrost is limited. Therefore, this study aims at characterizing the site specific ambient seismic vibration recorded at the Matterhorn Hörnligrat fieldsite over the course of more than three years. The observed normal mode resonance frequencies vary seasonally with four distinct phases: persistent decrease during summer (phase I), rapid increase during freezing (phase II), trough-shaped pattern in winter (phase III) and a sharp peak with a rapid decay during the melting/thawing season (phase IV). The relation between resonance frequency and rock temperature exhibits an annually repeated pattern with hysteretic behavior. The link between resonance frequency, fracture width and rock temperature indicates that irreversible fracture displacement is dominant in summer periods with low resonance frequency. These findings suggest that the temporal variations in resonance frequencies are linked to the formation and melt of ice-fill in bedrock fractures. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109664
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geography, University of Zurich, Switzerland; Swiss Seismological Service, ETH Zurich, Switzerland; Computer Engineering and Networks Laboratory, ETH Zurich, Switzerland; Carleton University, Ottawa, Canada
Recommended Citation:
Weber S.,Fäh D.,Beutel J.,et al. Ambient seismic vibrations in steep bedrock permafrost used to infer variations of ice-fill in fractures[J]. Earth and Planetary Science Letters,2018-01-01,501