气候变化领域集成服务门户(CCPortal): P Wave Tomography Beneath Greenland and Surrounding Regions: 1. Crust and Upper Mantle

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DOI	10.1029/2020JB019837
	P Wave Tomography Beneath Greenland and Surrounding Regions: 1. Crust and Upper Mantle
	Toyokuni G.; Matsuno T.; Zhao D.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	We study the 3-D P wave velocity (Vp) structure of the crust and upper mantle beneath Greenland and surrounding regions using the latest P wave arrival time data. The Greenland Ice Sheet Monitoring Network (GLISN), initiated in 2009, is an international project for seismic observation in these regions using 34 stations. We use a regional seismic tomography method to simultaneously invert P wave arrival times of local earthquakes and P wave relative traveltime residuals of teleseismic events. These data are extracted from the ISC-EHB catalog; however, for the teleseismic data, we picked new arrival times from seismograms using a cross-correlation method. Our tomographic results clearly reveal the Iceland plume, the Jan Mayen plume, and a newly discovered “Svalbard plume,” which merge together in the mantle transition zone. A high-Vp body exists beneath the Greenland Sea, which might act as an obstacle against the rising Svalbard plume. Furthermore, our results reveal a remarkable low-Vp anomaly elongated in the NW-SE direction at depths ≤250 km beneath central Greenland, which is connected with the Iceland and Jan Mayen hotspots. Although previous studies have suggested a similar feature, our result is the first to show the low-Vp zone existing at all depths in the Greenland lithosphere, and its spatial distribution coincides with a high heat flux region. These characteristics indicate that the low-Vp zone reflects residual heat from the Iceland plume when the Greenland lithosphere passed over this plume at ~80–20 Ma. Our results also indicate the possible existence of residual heat from the Jan Mayen plume. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	ancient heat track; crust and upper mantle; Greenland; Iceland hotspot; seismic tomography; The Greenland Ice Sheet Monitoring Network (GLISN)
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/187477
作者单位	Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan; Now at Mitsubishi Gas Chemical Company, Inc., Tokyo, Japan
推荐引用方式 GB/T 7714	Toyokuni G.,Matsuno T.,Zhao D.. P Wave Tomography Beneath Greenland and Surrounding Regions: 1. Crust and Upper Mantle[J],2020,125(12).
APA	Toyokuni G.,Matsuno T.,&Zhao D..(2020).P Wave Tomography Beneath Greenland and Surrounding Regions: 1. Crust and Upper Mantle.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Toyokuni G.,et al."P Wave Tomography Beneath Greenland and Surrounding Regions: 1. Crust and Upper Mantle".Journal of Geophysical Research: Solid Earth 125.12(2020).