气候变化领域集成服务门户(CCPortal): Glacial Earthquakes and Precursory Seismicity Associated With Thwaites Glacier Calving

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DOI	10.1029/2019GL086178
	Glacial Earthquakes and Precursory Seismicity Associated With Thwaites Glacier Calving
	Winberry J.P.; Huerta A.D.; Anandakrishnan S.; Aster R.C.; Nyblade A.A.; Wiens D.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	We observe two (~MS 3) long-period (10–30 s) seismic events that originate from the terminus of Thwaites Glacier, Antarctica. Serendipitous acquisition of satellite images confirm that the seismic events were glacial earthquakes generated during the capsizing of icebergs. The glacial earthquakes were preceded by 6 days of discrete high-frequency seismic events that can be observed at distances exceeding 250 km. The high-frequency seismicity displays an increasing rate of occurrence, culminating in several hours of sustained tremor coeval with the long-period events. A series of satellite images collected during this precursory time period show that the high-frequency events and tremor are the result of accelerating growth of ancillary fractures prior to the culminating calving event. This study indicates that seismic data have the potential to elucidate the processes by which Thwaites Glacier discharges into the ocean, thus improving our ability to constrain future sea level rise. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Glacial geology; Sea ice; Sea level; Glacier discharges; High frequency HF; Long-period events; Satellite images; Sea level rise; Seismic datas; Seismic event; Time-periods; Earthquakes; earthquake event; fracture mechanics; glacial environment; satellite imagery; sea level change; seismic data; thawing; Antarctica; Thwaites Glacier; West Antarctica
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/170794
作者单位	Department of Geological Sciences, Central Washington University, Ellensburg, WA, United States; Department of Geosciences, Pennsylvania State University, University ParkPA, United States; Department of Geosciences, Colorado State University, Fort Collins, CO, United States; Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, MO, United States
推荐引用方式 GB/T 7714	Winberry J.P.,Huerta A.D.,Anandakrishnan S.,et al. Glacial Earthquakes and Precursory Seismicity Associated With Thwaites Glacier Calving[J],2020,47(3).
APA	Winberry J.P.,Huerta A.D.,Anandakrishnan S.,Aster R.C.,Nyblade A.A.,&Wiens D.A..(2020).Glacial Earthquakes and Precursory Seismicity Associated With Thwaites Glacier Calving.Geophysical Research Letters,47(3).
MLA	Winberry J.P.,et al."Glacial Earthquakes and Precursory Seismicity Associated With Thwaites Glacier Calving".Geophysical Research Letters 47.3(2020).