气候变化领域集成服务门户(CCPortal): Slab Models Beneath Central Myanmar Revealed by a Joint Inversion of Regional and Teleseismic Traveltime Data

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DOI	10.1029/2020JB020164
	Slab Models Beneath Central Myanmar Revealed by a Joint Inversion of Regional and Teleseismic Traveltime Data
	Yao J.; Liu S.; Wei S.; Hubbard J.; Huang B.-S.; Chen M.; Tong P.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	The intermediate-depth (50–180 km) seismicity beneath Myanmar provides direct evidence of the subducting Indian slab. However, the historic lack of regional seismic observations leads to previous low-resolution models that show large variations in slab geometry beneath Myanmar. The depth extent and morphology of the slab are still poorly known. In this study, we conduct a joint inversion of regional and teleseismic P-wave traveltimes from recently installed networks to image seismic velocity structures beneath central Myanmar by adopting an eikonal equation-based traveltime tomography method. The observations contain a total of 6,069 regional first P-wave arrivals and 29,787 teleseismic P-wave differential traveltimes. We find a high P-wave velocity anomaly beneath central Myanmar, which starts from ∼50 km depth and extends continuously to the mantle transition zone (MTZ) and is interpreted as the subducting Indian slab. Below 100 km depth, the dip angle of the slab in the south is ∼15° larger than that of the slab in the north, suggesting a possible slab tearing. Based on our tomographic results and previous studies, the slab in the north is inferred to have a deep stagnant segment lying above the 660-km discontinuity in the MTZ, but whether it is connected with the shallow dipping slab cannot be confirmed. Meanwhile, the slab in the south may just stay in the upper mantle (above 410 km), but it may also have penetrated the 410-km discontinuity. Taking into account all the scenarios, we propose four possible models of the Indian Plate subduction system beneath central Myanmar. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Indian Plate subduction; Myanmar tectonics; Myanmar volcanos; subducting slab; traveltime tomography
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/187348
作者单位	School of Physical and Mathematical Sciences, Division of Mathematical Sciences, Nanyang Technological University, Singapore, Singapore; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore; Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China; Asian School of the Environment, Nanyang Technological University, Singapore, Singapore; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
推荐引用方式 GB/T 7714	Yao J.,Liu S.,Wei S.,et al. Slab Models Beneath Central Myanmar Revealed by a Joint Inversion of Regional and Teleseismic Traveltime Data[J],2021,126(2).
APA	Yao J..,Liu S..,Wei S..,Hubbard J..,Huang B.-S..,...&Tong P..(2021).Slab Models Beneath Central Myanmar Revealed by a Joint Inversion of Regional and Teleseismic Traveltime Data.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Yao J.,et al."Slab Models Beneath Central Myanmar Revealed by a Joint Inversion of Regional and Teleseismic Traveltime Data".Journal of Geophysical Research: Solid Earth 126.2(2021).