DOI: 10.1002/2015GL066785
论文题名: Complex force history of a calving-generated glacial earthquake derived from broadband seismic inversion
作者: Sergeant A. ; Mangeney A. ; Stutzmann E. ; Montagner J.-P. ; Walter F. ; Moretti L. ; Castelnau O.
刊名: Geophysical Research Letters
ISSN: 0094-9416
EISSN: 1944-9147
出版年: 2016
卷: 43, 期: 3 起始页码: 1055
结束页码: 1065
语种: 英语
英文关键词: glacial earthquake
; iceberg calving
; source inversion
Scopus关键词: Geophysics
; Glacial geology
; Sea ice
; Seismology
; Broadband seismograms
; Dynamical constraints
; Force amplitude
; Function of time
; Iceberg calving
; Seismic inversion
; Source inversion
; Source time functions
; Earthquakes
; amplitude
; collision zone
; complexity
; earthquake engineering
; force
; historical record
; iceberg calving
; seismic method
; seismograph
; Arctic
; Greenland
; Jakobshavn Glacier
英文摘要: The force applied to the Earth by the calving of two icebergs at Jakobshavn Isbrae, Greenland, has been quantified. The source force history was recovered by inversion of regional broadband seismograms without any a priori constraint on the source time function, in contrast with previous studies. For periods 10-100 s, the three-component force can be obtained from distant stations alone and is proportional to the closest station seismograms. This inversion makes it possible to quantify changes of the source force direction and amplitude as a function of time and frequency. A detailed comparison with a video of the event was used to identify four forces associated with collision, then bottom-out and top-out rotation of the first and second icebergs, and ice mélange motion. Only the two iceberg rotations were identified in previous studies. All four processes are found here to contribute to the force amplitude and variability. Such a complete time-frequency force history provides unique dynamical constraints for mechanical calving models. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961287032&doi=10.1002%2f2015GL066785&partnerID=40&md5=2e776b0769a3286bce2d5536962fc075
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10379
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: Seismology Group, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, UMR 7154, CNRS, France
Recommended Citation:
Sergeant A.,Mangeney A.,Stutzmann E.,et al. Complex force history of a calving-generated glacial earthquake derived from broadband seismic inversion[J]. Geophysical Research Letters,2016-01-01,43(3).