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Sn-wave velocity structure of the uppermost mantle beneath the Australian continent

文献类型：期刊论文

作者Wei, Zhi1,2; Kennett, Brian L. N.3; Sun, Weijia1
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2018-06-01
卷号213期号:3页码:2071-2084
关键词Structure of the Earth Australia Body waves Seismic tomography
ISSN号0956-540X
DOI10.1093/gji/ggy109
文献子类Article
英文摘要We have extracted a data set of more than 5000 Sn traveltimes for source-station pairs within continental Australia, with 3-D source relocation using Pn arrivals to improve data consistency. We conduct tomographic inversion for S-wave-speed structure down to 100 km using the Fast Marching Tomography (FMTOMO) method for the whole Australian continent. We obtain a 3D-model with potential resolution of 3.0 degrees x3.0 degrees. The newS-wave-speed model provides strong constraints on structure in a zone that was previously poorly characterized. The S velocities in the uppermost mantle are rather fast, with patterns of variation generally corresponding to those for Pn. We find strong heterogeneities of S wave speed in the uppermost mantle across the entire continent of Australia with a close relation to crustal geological features. For instance, the cratons in the western Australia usually have high S velocities (> 4.70 km s-(1)), while the volcanic regions on the eastern margin of Australia are characterized by low S velocities (< 4.40 km s(-1)). Exploiting an equivalent Pn inversion, we also determine the V-p/V-s ratios across the whole continent. We find that most of the uppermost mantle has V-p/V-s between 1.65 and 1.85, but with patches in central Australia and in the east with much higher V-p/V-s ratios. Distinctive local anomalies on the eastern margin may indicate the positions of remnants of mantle plumes.
WOS关键词CRUST ; LITHOSPHERE ; TOMOGRAPHY ; MODEL ; ALGORITHM ; INVERSION ; COMPONENT ; LOCATION ; WESTERN ; PHASES
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000434675800042
出版者OXFORD UNIV PRESS
资助机构China Scholarship Council(201604910731) ; China Scholarship Council(201604910731) ; AuScope AuSREM project ; AuScope AuSREM project ; National Natural Science Foundation of China(41374065 ; National Natural Science Foundation of China(41374065 ; 41674060) ; 41674060) ; China Scholarship Council(201604910731) ; China Scholarship Council(201604910731) ; AuScope AuSREM project ; AuScope AuSREM project ; National Natural Science Foundation of China(41374065 ; National Natural Science Foundation of China(41374065 ; 41674060) ; 41674060) ; China Scholarship Council(201604910731) ; China Scholarship Council(201604910731) ; AuScope AuSREM project ; AuScope AuSREM project ; National Natural Science Foundation of China(41374065 ; National Natural Science Foundation of China(41374065 ; 41674060) ; 41674060) ; China Scholarship Council(201604910731) ; China Scholarship Council(201604910731) ; AuScope AuSREM project ; AuScope AuSREM project ; National Natural Science Foundation of China(41374065 ; National Natural Science Foundation of China(41374065 ; 41674060) ; 41674060)
源URL[http://ir.iggcas.ac.cn/handle/132A11/88239]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Wei, Zhi
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia
推荐引用方式
GB/T 7714		 Wei, Zhi,Kennett, Brian L. N.,Sun, Weijia. Sn-wave velocity structure of the uppermost mantle beneath the Australian continent[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,213(3):2071-2084.
APA Wei, Zhi,Kennett, Brian L. N.,&Sun, Weijia.(2018).Sn-wave velocity structure of the uppermost mantle beneath the Australian continent.GEOPHYSICAL JOURNAL INTERNATIONAL,213(3),2071-2084.
MLA Wei, Zhi,et al."Sn-wave velocity structure of the uppermost mantle beneath the Australian continent".GEOPHYSICAL JOURNAL INTERNATIONAL 213.3(2018):2071-2084.

入库方式： OAI收割

来源：地质与地球物理研究所

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