气候变化领域集成服务门户(CCPortal): Direct Inversion of S-P Differential Arrival Times for VpVs Ratio in SE Asia

CCPortal

DOI	10.1029/2019JB019152
	Direct Inversion of S-P Differential Arrival Times for VpVs Ratio in SE Asia
	Zenonos A.; De Siena L.; Widiyantoro S.; Rawlinson N.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Southeast Asia lies within one of the most complex tectonic settings on Earth and exhibits a range of features, including strongly curved subduction zones, arc-continent collision, and slab break-off, which are not well understood. To help gain insight into mantle structure and processes beneath this region, we perform an inversion for variations in Vp, Vs, and (Formula presented.) structure using arrival time information from the ISC-EHB catalog. The oceanic lithosphere subducting beneath Java is imaged as a positive dVp and negative d(Vp/Vs) anomaly. At 200 km depth, the forearc mantle beneath Sumatra and Java is revealed by positive dVp and d(Vp/Vs) anomalies which cease at Sumba island, where negative d(Vp/Vs) anomalies mark the presence of cold Australian lithosphere (down to 200–250 km depth) which is colliding with Sundaland. These negative d(Vp/Vs) anomalies depict a ∼WE trending structure that appears to correspond with the underthrusting of Australian continental crust. One notable salient has a location and shape which appears to coincide with those of ancient terranes or a Gondwana-related microcontinent reconstructed by paleogeographic studies and may have been entrained in the subduction process. The velocity and d(Vp/Vs) patterns beneath the Banda Arc support the existence of a single curved subducting slab associated with rollback. The extreme extensional strike-slip setting in Seram produces the highest positive d(Vp/Vs) anomalies in the model which may be due to one or more of widespread serpentinization, high concentrations of intraslab fluid-filled faulting, and mantle upwelling. ©2020.The Authors.
英文关键词	joint inversion; SE Asia; tomography; traveltime; Vp/Vs
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/187871
作者单位	School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom; Institute of Geosciences, Johannes Gutenberg University, Mainz, Germany; Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, Indonesia; Faculty of Engineering, Maranatha Christian University Bandung, Bandung, Indonesia; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Zenonos A.,De Siena L.,Widiyantoro S.,et al. Direct Inversion of S-P Differential Arrival Times for VpVs Ratio in SE Asia[J],2020,125(5).
APA	Zenonos A.,De Siena L.,Widiyantoro S.,&Rawlinson N..(2020).Direct Inversion of S-P Differential Arrival Times for VpVs Ratio in SE Asia.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Zenonos A.,et al."Direct Inversion of S-P Differential Arrival Times for VpVs Ratio in SE Asia".Journal of Geophysical Research: Solid Earth 125.5(2020).