Depth variations of azimuthal anisotropy beneath the Tian Shan Mt range (NW China) from ambient noise tomography
文献类型：期刊论文
| 作者 | Guo, Zhi2; Gao, Xing3; Yao, Huajian1,4; Wang, Wei3 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2017-05-01 |
| 卷号 | 138页码:161-172 |
| 关键词 | The Tian Shan Mt range Azimuthal anisotropy Crustal structure Seismic ambient noise tomography |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2016.12.040 |
| 通讯作者 | Gao, Xing(gxing@igsnrr.ac.cn) |
| 英文摘要 | Seismic 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. |
| WOS关键词 | CENTRAL TIEN-SHAN ; CONTINENTAL UPPER-MANTLE ; WAVE VELOCITY STRUCTURE ; SEISMIC ANISOTROPY ; CENTRAL-ASIA ; SOURCE PARAMETERS ; TARIM BASIN ; CONTEMPORARY TECTONICS ; NEIGHBORING REGIONS ; CENOZOIC TECTONICS |
| 资助项目 | National 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] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000401376300014 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China ; Basic Scientific Funding of Institute of Geology, China Earthquake Administration |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/64484]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Gao, Xing |
| 作者单位 | 1.Natl Geophys Observ Mengcheng, Mengcheng, Anhui, Peoples R China 2.China Earthquake Adm, Inst Geol, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China 4.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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