气候变化领域集成服务门户(CCPortal): Stick-Slip Tremor Beneath an Alpine Glacier

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DOI	10.1029/2020GL090528
	Stick-Slip Tremor Beneath an Alpine Glacier
	Umlauft J.; Lindner F.; Roux P.; Mikesell T.D.; Haney M.M.; Korn M.; Walter F.T.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	Sliding of glacial ice over its base is typically described by a frictionless or slowly deforming bed. This view is challenged by recent seismic observations of stick-slip motion at the ice-bed interface. We revisit a high-frequency (20–35 Hz) harmonic tremor recorded on Gornergletscher, Switzerland. In contrast to previous interpretation in terms of glaciohydraulic tremor, we present evidence for superimposed stick-slip episodes as tremor sources: we locate the tremor source with matched field processing polarity optimization, which allows for azimuthal polarity patterns associated with nonisotropic moment tensors and yields a tremor source clustering near the glacier bed. Our analysis confirms an S wave radiation pattern in agreement with a double-couple source derived from ice sliding over bedrock and explains our tremor observations in terms of glacier stick-slip motion. Adding to observations of stick-slip tremor beneath polar ice streams, this first report on stick-slip tremor beneath Alpine ice favors widespread seismogenic glacier sliding. © 2020. The Authors.
英文关键词	Ice; Shear waves; Slip forming; Alpine glacier; Glacial ice; High frequency HF; Matched field processing; Moment tensors; Seismic observation; Stick slip motion; Switzerland; Stick-slip
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169181
作者单位	Institute of Geophysics and Geology, Leipzig University, Leipzig, Germany; Department of Earth and Environmental Sciences, LMU Munich, Munich, Germany; ETH Zurich, Laboratory of Hydraulics, Hydrology and Glaciology, Zurich, Switzerland; ISTerre - Maison des Géosciences, Grenoble, France; Department of Geosciences, Environmental Seismology Laboratory, Boise State University, Boise, ID, United States; U.S. Geological Survey, Alaska Volcano Observatory, Anchorage, AK, United States
推荐引用方式 GB/T 7714	Umlauft J.,Lindner F.,Roux P.,et al. Stick-Slip Tremor Beneath an Alpine Glacier[J],2021,48(2).
APA	Umlauft J..,Lindner F..,Roux P..,Mikesell T.D..,Haney M.M..,...&Walter F.T..(2021).Stick-Slip Tremor Beneath an Alpine Glacier.Geophysical Research Letters,48(2).
MLA	Umlauft J.,et al."Stick-Slip Tremor Beneath an Alpine Glacier".Geophysical Research Letters 48.2(2021).