P-wave Tomography and Azimuthal Anisotropy of the Manila-Taiwan-Southern Ryukyu Region

doi:10.1029/2020TC006262

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	P-wave Tomography and Azimuthal Anisotropy of the Manila-Taiwan-Southern Ryukyu Region
	Fan, Jianke 1,2,3; Zhao, Dapeng 4
刊名	TECTONICS
	2021-02-01
卷号	40 期号:2 页码:18
ISSN号	0278-7407
DOI	10.1029/2020TC006262
通讯作者	Fan, Jianke(fanjianke@qdio.ac.cn)
英文摘要	Taiwan is considered to be created by interactions between the Manila and Ryukyu subduction zones, which form a normal double-slab subduction system. Because of the two opposite dipping subductions of the Eurasian Plate (EP) and the Philippine Sea Plate (PSP) around Taiwan, subduction polarity reversal beneath northern Taiwan is presumed, which is accounted for by a slab breakoff model. However, this model has not been convincingly supported by tomographic results so far. Moreover, details of the dynamic process and deformation in this normal double-slab subduction system are still unclear. In this work, we determine high-resolution 3-D tomographic images of isotropic P-wave velocity and azimuthal anisotropy beneath the Manila-Taiwan-southern Ryukyu region, which provide substantial observational constraints on this double-slab subduction system. Our results clearly show the subducted EP breakoff beneath northern Taiwan. We propose two possible factors causing the slab breakoff: the subducted EP rollback under its own gravity after its subduction cessation and collision with the subducted PSP, which may jointly cause the slab breakoff beneath northern Taiwan after a longer collision history. In addition, the subducted EP rollback may be responsible for magmatism and basalts around Taiwan, as well as recent big earthquakes beneath the Taiwan Strait and the South China Sea (SCS). Our results also reveal anisotropy parallel with the SCS fossil ridge beneath the northernmost Luzon Island. We suggest that the fossil ridge and buoyant plateau subduction and/or the ridge-parallel mantle flow during the SCS seafloor spreading may result in the ridge-parallel anisotropy.
资助项目	National Natural Science Foundation of China[41876043] ; National Natural Science Foundation of China[41976052] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; Japan Society for the Promotion of Science[19H01996]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000624423100009
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/170160]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Fan, Jianke
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 4.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Miyagi, Japan
推荐引用方式 GB/T 7714	Fan, Jianke,Zhao, Dapeng. P-wave Tomography and Azimuthal Anisotropy of the Manila-Taiwan-Southern Ryukyu Region[J]. TECTONICS,2021,40(2):18.
APA	Fan, Jianke,&Zhao, Dapeng.(2021).P-wave Tomography and Azimuthal Anisotropy of the Manila-Taiwan-Southern Ryukyu Region.TECTONICS,40(2),18.
MLA	Fan, Jianke,et al."P-wave Tomography and Azimuthal Anisotropy of the Manila-Taiwan-Southern Ryukyu Region".TECTONICS 40.2(2021):18.