气候变化领域集成服务门户(CCPortal): 3-D Sedimentary Structures Beneath Southeastern Australia Constrained by Passive Seismic Array Data

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DOI	10.1029/2020JB019998
	3-D Sedimentary Structures Beneath Southeastern Australia Constrained by Passive Seismic Array Data
	Li G.; Yang Y.; Niu F.; Chen M.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	A high-resolution sedimentary map of southeastern Australia is of great importance to explore natural resources as well as to evaluate seismic hazards. In this study, we build a 3-D Vs model of the upper crust beneath southeastern Australia by jointly inverting Rayleigh wave phase velocity, ellipticity, and teleseismic P-coda waves. At depths less than 3 km, sedimentary basins are revealed as prominent low-velocity anomalies. The average sediment depth in the Murray Basin is ∼713 m with the maximum depth reaching 1,500 m, while, in the Sydney-Gunnedah-Bowen Basin (SGBB), the average sediment depth is 600 m with a maximum depth of ∼3,000 m. Vs of the sedimentary layer in the Murray Basin is lower than that in the SGBB, suggesting that the sediments in the Murray Basin are less consolidated compared with those in the SGBB. The unconsolidated sediments make the Murray Basin more vulnerable to seismic hazards. In the upper and middle crystalline crust, we image two low-velocity zones: one beneath the Adelaide Fold Belt and the other beneath the Begargo Hill volcanic zone. The low-velocity zone beneath the Adelaide Fold Belt is likely caused by high temperature and/or a weak granitic composition, which lead to the concentration of intraplate seismic activities in this area. The low-velocity zone beneath the Begargo Hill Volcanic zone indicates that there exists magma in the upper to middle crust or the temperature there is still very high after the latest eruption. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	basin structure; joint inversion; Murray Basin; southeastern Australia; Sydney-Gunnedah-Bowen Basin
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/187343
作者单位	State Key Laboratory of Petroleum Resource and Prospecting, Unconventional Petroleum Research Institute, China University of Petroleum at Beijing, Beijing, China; Department of Earth and Planetary Science, Australian Research Council Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Macquarie University, North Ryde, NSW, Australia; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, United States; Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, MI, United States; Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States
推荐引用方式 GB/T 7714	Li G.,Yang Y.,Niu F.,et al. 3-D Sedimentary Structures Beneath Southeastern Australia Constrained by Passive Seismic Array Data[J],2021,126(2).
APA	Li G.,Yang Y.,Niu F.,&Chen M..(2021).3-D Sedimentary Structures Beneath Southeastern Australia Constrained by Passive Seismic Array Data.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Li G.,et al."3-D Sedimentary Structures Beneath Southeastern Australia Constrained by Passive Seismic Array Data".Journal of Geophysical Research: Solid Earth 126.2(2021).