气候变化领域集成服务门户(CCPortal): Seismic Imaging of the Crust Beneath Arunachal Himalaya

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DOI	10.1029/2020JB020616
	Seismic Imaging of the Crust Beneath Arunachal Himalaya
	Singh A.; Saikia D.; Kumar M.R.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	We present the first high-resolution seismic images of the crust beneath the Arunachal Himalaya, using 22,525 high quality teleseismic receiver functions (RFs). Data from 32 broadband seismic stations deployed in the Arunachal Himalaya during 2010–2016 is used for this purpose. In addition, data from the HIMNT, SIKKIM, Hi-CLIMB, and Geodynamics ANd Seismic Structure of the Eastern-Himalaya Region networks are used to investigate along strike variations in the crustal architecture of the Eastern Himalayan mountain belt. Common Conversions Point stacks constructed using RFs from 203 seismic stations along various S-N profiles reveal lateral variations in the crustal structure. We observe, (a) a less complex crust beneath the Arunachal Himalaya compared to that in the Nepal and Sikkim Himalaya (b) a highly deformed layer running parallel to the Main Himalayan Thrust (c) intermittent anisotropic low velocity layer in the middle crust (d) that the crustal thickness estimates are in close agreement with those in other segments of the Eastern Himalaya (40–60 kms) (e) no prominent signatures of a mid-crustal ramp as observed in the Nepal Himalaya. The geometry of the crust in the Eastern Himalayan segments appears less complex compared to the Central Himalayan segments. The presence of strong anisotropy associated with the low velocity layer at depths of 20–30 km suggests a mechanically weak middle crust beneath Arunachal Himalaya. Attributing these anisotropic signatures to the channel flow model appears contentious. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Arunachal Himalaya; crustal structure; receiver functions
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/187275
作者单位	Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur, India; ESSO-Indian National Center for Ocean Information Services, Hyderabad, India; National Geophysical Research Institute, Hyderabad, India
推荐引用方式 GB/T 7714	Singh A.,Saikia D.,Kumar M.R.. Seismic Imaging of the Crust Beneath Arunachal Himalaya[J],2021,126(3).
APA	Singh A.,Saikia D.,&Kumar M.R..(2021).Seismic Imaging of the Crust Beneath Arunachal Himalaya.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Singh A.,et al."Seismic Imaging of the Crust Beneath Arunachal Himalaya".Journal of Geophysical Research: Solid Earth 126.3(2021).