气候变化领域集成服务门户(CCPortal): Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array

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DOI	10.1029/2019JC015709
	Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array
	Moreau L.; Boué P.; Serripierri A.; Weiss J.; Hollis D.; Pondaven I.; Vial B.; Garambois S.; Larose É.; Helmstetter A.; Stehly L.; Hillers G.; Gilbert O.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	Field data are needed for a better understanding of sea ice decline in the context of climate change. The rapid technological and methodological advances of the last decade have led to a reconsideration of seismic methods in this matter. In particular, passive seismology has filled an important gap by removing the need to use active sources. We present a seismic experiment where an array of 247 geophones was deployed on sea ice, in the Van Mijen fjord near Sveagruva (Svalbard). The array is a mix of 1C and 3C stations with sampling frequencies of 500 and 1000 Hz. They recorded continuously the ambient seismic field in sea ice between 28 February and 26 March 2019. Data also include active acquisitions on 1 and 26 March with a radar antenna, a shaker unit, impulsive sources, and artificial sources of seismic noise. This data set is of unprecedented quality regarding sea ice seismic monitoring, as it also includes thousands of microseismic events recorded each day. By combining passive seismology approaches with specific array processing methods, we demonstrate that the multimodal dispersion curves of sea ice can be calculated without an active source and then used to infer sea ice properties. We calculated an ice thickness, Young's modulus, and Poisson's ratio with values h=54±3 cm, E=3.9±0.15 GPa, and ν=0.34±0.02 on 1 March, and h=58±3 cm, E=4.4±0.15 GPa, and ν=0.32±0.02 on 5 March. These values are consistent with in situ field measurements and observations. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	array processing; guided waves; mechanical properties; sea ice monitoring; seismic noise; thickness
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186924
作者单位	Institut des Sciences de la Terre, Université Grenoble Alpes, Grenoble, France; Institute of Seismology, University of Helsinki, Helsinki, Finland
推荐引用方式 GB/T 7714	Moreau L.,Boué P.,Serripierri A.,et al. Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array[J],2020,125(4).
APA	Moreau L..,Boué P..,Serripierri A..,Weiss J..,Hollis D..,...&Gilbert O..(2020).Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array.Journal of Geophysical Research: Oceans,125(4).
MLA	Moreau L.,et al."Sea Ice Thickness and Elastic Properties From the Analysis of Multimodal Guided Wave Propagation Measured With a Passive Seismic Array".Journal of Geophysical Research: Oceans 125.4(2020).