DOI: 10.5194/tc-15-283-2021
论文题名: Passive seismic recording of cryoseisms in Adventdalen, Svalbard
作者: Romeyn R. ; Hanssen A. ; Ole Ruud B. ; Meling Stemland H. ; Arne Johansen T.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 1 起始页码: 283
结束页码: 302
语种: 英语
英文关键词: cryosphere
; dispersion
; frost
; geophone
; geophysical array
; monitoring system
; pavement
; permafrost
; river terrace
; seismic data
; seismic wave
; surface wave
; theoretical study
; wave energy
; Arctic
; Svalbard
; Svalbard and Jan Mayen
英文摘要: pA series of transient seismic events were discovered in passive seismic recordings from 2-D geophone arrays deployed at a frost polygon site in Adventdalen, Svalbard. These events contain a high proportion of surface wave energy and produce high-quality dispersion images using an apparent offset re-sorting and inter-Trace delay minimisation technique to locate the seismic source, followed by cross-correlation beamforming dispersion imaging. The dispersion images are highly analogous to surface wave studies of pavements and display a complex multimodal dispersion pattern. Supported by theoretical modelling based on a highly simplified arrangement of horizontal layers, we infer that a span classCombining double low lineinline-formulag1/43.5/span-4.5 span classCombining double low lineinline-formulam/span thick, stiff, high-velocity layer overlies a span classCombining double low lineinline-formulag1/430/span span classCombining double low lineinline-formulam/span thick layer that is significantly softer and slower at our study site. Based on previous studies we link the upper layer with syngenetic ground ice formed in aeolian sediments, while the underlying layer is linked to epigenetic permafrost in marine-deltaic sediments containing unfrozen saline pore water. Comparing events from spring and autumn indicates that temporal variation can be resolved via passive seismic monitoring. The transient seismic events that we record occur during periods of rapidly changing air temperature. This correlation, along with the spatial clustering along the elevated river terrace in a known frost polygon, ice-wedge area and the high proportion of surface wave energy, constitutes the primary evidence for us to interpret these events as frost quakes, a class of cryoseism. In this study we have proved the concept of passive seismic monitoring of permafrost in Adventdalen, Svalbard./p. © Author(s) 2021. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164792
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, University of Tromsø, Arctic University of Norway, Tromsø, 9037, Norway; Research Centre for Arctic Petroleum Exploration (ARCEx), Tromsø, 9037, Norway; Department of Earth Science, University of Bergen, Bergen, 5007, Norway; University Centre in Svalbard (UNIS), Longyearbyen, 9171, Norway
Recommended Citation:
Romeyn R.,Hanssen A.,Ole Ruud B.,et al. Passive seismic recording of cryoseisms in Adventdalen, Svalbard[J]. Cryosphere,2021-01-01,15(1)