气候变化领域集成服务门户(CCPortal): Estimation of Seismic Attenuation of the Greenland Ice Sheet Using 3-D Waveform Modeling

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DOI	10.1029/2021JB021694
	Estimation of Seismic Attenuation of the Greenland Ice Sheet Using 3-D Waveform Modeling
	Toyokuni G.; Komatsu M.; Takenaka H.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	We estimated the seismic attenuation (Q factor) of the Greenland Ice Sheet (GrIS) by comparing observed and theoretical Rayleigh waveforms. Observed waveforms are obtained by interfering noise waveforms in vertical-component seismograms between stations belonging to the latest broadband seismic network distributed throughout Greenland (GLISN network). Theoretical waveforms are calculated by parallel computation using the latest 3-D seismic waveform modeling method. Comparing the observed waveforms with the theoretical waveforms at different Q factors reveals that the GrIS has a low Q of 10 ≤ QP, QS ≤ 50, indicating very high attenuation of seismic waves due to the ice. This study is the first to establish the low Q factor of ice sheets via ultra-long-distance propagation (350−1,000 km). The Q factors obtained in this study are indispensable for estimating the thermal state and density distribution of the GrIS, as well as for interpreting the characteristics of seismic waveform that propagates through the GrIS. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	3-D modeling; finite-difference method (FDM); Greenland Ice Sheet (GrIS); Greenland Ice Sheet Monitoring Network (GLISN); Q factor; seismic attenuation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187249
作者单位	Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan; Department of Earth Sciences, Okayama University, Okayama, Japan
推荐引用方式 GB/T 7714	Toyokuni G.,Komatsu M.,Takenaka H.. Estimation of Seismic Attenuation of the Greenland Ice Sheet Using 3-D Waveform Modeling[J],2021,126(4).
APA	Toyokuni G.,Komatsu M.,&Takenaka H..(2021).Estimation of Seismic Attenuation of the Greenland Ice Sheet Using 3-D Waveform Modeling.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Toyokuni G.,et al."Estimation of Seismic Attenuation of the Greenland Ice Sheet Using 3-D Waveform Modeling".Journal of Geophysical Research: Solid Earth 126.4(2021).