气候变化领域集成服务门户(CCPortal): Seismic Anisotropy and Mantle Deformation Beneath the Central Sunda Plate

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DOI	10.1029/2020JB021259
	Seismic Anisotropy and Mantle Deformation Beneath the Central Sunda Plate
	Song W.; Yu Y.; Gao S.S.; Liu K.H.; Fu Y.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The central Sunda plate, which forms the core of Southeast Asia, has been extensively studied based on analyses of data mainly from surface geological observations. In contrast, largely due to the limited coverage by seismic stations in the area, a number of key issues associated with mantle structure and dynamics remain enigmatic. These can possibly be constrained by investigating seismic azimuthal anisotropy in the upper mantle. Here we employ the shear wave splitting technique on three P-to-S converted phases from the core-mantle boundary (PKS, SKKS, and SKS) recorded by 11 stations to systematically explore the spatial variation of azimuthal anisotropy beneath the central Sunda plate. Most of the Malay Peninsula is revealed to possess mostly trench-perpendicular fast orientations that can be attributed to mantle flow induced by the Indo-Australian subduction. In addition, the central part of the Malay Peninsula is characterized by a 2-layered model of anisotropy, which is possibly associated with the joint effects of lithospheric fabrics and a slab tear-induced toroidal flow. Absolute plate motion (APM)-parallel anisotropy is observed in northern Borneo and the Nansha Block, where APM-driven simple shear in the transitional layer between the partially coupled lithosphere and asthenosphere is mostly responsible for the observed anisotropy. The APM-induced flow may be locally modified by a fossil slab segment beneath Sabah. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	complex mantle flows; shear wave splitting; slab tear; subduction; sunda plate
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/187286
作者单位	State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO, United States; Shanghai Sheshan National Geophysical Observatory, Shanghai, China
推荐引用方式 GB/T 7714	Song W.,Yu Y.,Gao S.S.,et al. Seismic Anisotropy and Mantle Deformation Beneath the Central Sunda Plate[J],2021,126(3).
APA	Song W.,Yu Y.,Gao S.S.,Liu K.H.,&Fu Y..(2021).Seismic Anisotropy and Mantle Deformation Beneath the Central Sunda Plate.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Song W.,et al."Seismic Anisotropy and Mantle Deformation Beneath the Central Sunda Plate".Journal of Geophysical Research: Solid Earth 126.3(2021).