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Depth variations of azimuthal anisotropy beneath the Tian Shan Mt range (NW China) from ambient noise tomography
Guo, Zhi1; Gao, Xing2; Yao, Huajian3,4; Wang, Wei2
2017-05-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume138Pages:161-172
Corresponding AuthorGao, Xing(gxing@igsnrr.ac.cn)
AbstractSeismic anisotropy beneath the Tian Shan Mt range has been well studied with shear wave splitting. The origin of asthenospheric anisotropy is mainly attributed to the north-south shortening. However, the crustal anisotropy and its depth variation are poorly constrained. In this study, we focus on inversion of Rayleigh wave phase velocity azimuthal anisotropy in the 5-35 s period bands beneath the Tian Shan Mt range through analysis of continuous seismic ambient noise. We use approximately 7 months of available continuous seismic data recorded by 31 broadband seismic stations deployed in the Tian Shan Mt range. The tomographic results reveal substantial variations in the azimuthal anisotropy with an increase in the depth. In the upper crustal depths, the orogen-parallel or orogen-subparallel azimuthal anisotropy observed in the Tian Shan Mt range likely originates from the lattice-preferred orientation of crustal minerals in response to compression, whereas the orogen-perpendicular or orogen-sub-perpendicular azimuthal anisotropy in the southern and northern piedmont of the Tian Shan Mt range is related to the stress-alignment of cracks/fractures due to ongoing north-south shortening. The pattern of azimuthal anisotropy in the middle to lower crustal and upper-most mantle is different from that at the upper crustal depths. An orogen-perpendicular or orogen-sub-perpendicular fast direction associated with prominent lower velocities has been observed north and south of Lake Issyk-Kul. The spatial correlation between the azimuthal anisotropy and the lower velocity anomalies at the middle to lower crustal and upper-most mantle depths may suggest a warm, melt-rich upper mantle below the Tian Shan Mt range, which could be attributed to the upwelling asthenospheric mantle flow in that region. (C) 2016 Published by Elsevier Ltd.
KeywordThe Tian Shan Mt range Azimuthal anisotropy Crustal structure Seismic ambient noise tomography
DOI10.1016/j.jseaes.2016.12.040
WOS KeywordCENTRAL TIEN-SHAN ; CONTINENTAL UPPER-MANTLE ; WAVE VELOCITY STRUCTURE ; SEISMIC ANISOTROPY ; CENTRAL-ASIA ; SOURCE PARAMETERS ; TARIM BASIN ; CONTEMPORARY TECTONICS ; NEIGHBORING REGIONS ; CENOZOIC TECTONICS
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41374061] ; National Natural Science Foundation of China[41574036] ; National Natural Science Foundation of China[41590862] ; National Natural Science Foundation of China[41204048] ; Basic Scientific Funding of Institute of Geology, China Earthquake Administration[IGCEA1418]
Funding OrganizationNational Natural Science Foundation of China ; Basic Scientific Funding of Institute of Geology, China Earthquake Administration
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000401376300014
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/64485
Collection中国科学院地理科学与资源研究所
Corresponding AuthorGao, Xing
Affiliation1.China Earthquake Adm, Inst Geol, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China
3.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei 230026, Anhui, Peoples R China
4.Natl Geophys Observ Mengcheng, Mengcheng, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Guo, Zhi,Gao, Xing,Yao, Huajian,et al. Depth variations of azimuthal anisotropy beneath the Tian Shan Mt range (NW China) from ambient noise tomography[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,138:161-172.
APA Guo, Zhi,Gao, Xing,Yao, Huajian,&Wang, Wei.(2017).Depth variations of azimuthal anisotropy beneath the Tian Shan Mt range (NW China) from ambient noise tomography.JOURNAL OF ASIAN EARTH SCIENCES,138,161-172.
MLA Guo, Zhi,et al."Depth variations of azimuthal anisotropy beneath the Tian Shan Mt range (NW China) from ambient noise tomography".JOURNAL OF ASIAN EARTH SCIENCES 138(2017):161-172.
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