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| DOI | 10.1093/gji/ggae123 |
| 2-D Sn wave attenuation tomography beneath the Eastern Himalaya | |
| 发表日期 | 2024 |
| ISSN | 0956-540X |
| EISSN | 1365-246X |
| 起始页码 | 237 |
| 结束页码 | 3 |
| 卷号 | 237期号:3 |
| 英文摘要 | The Arunachal and Bhutan Himalaya, which are tectonically distinct from other regions of the Himalaya, have a structure that is quite intricate. The eastern Himalayan segment is a component of the region where the Indian and Eurasian plates collided 50 Myr. The Indian Plate goes beneath the Eurasian Plate in the north, and in the eastern part of the region, the Indian Plate subducts under the Burmese Plate. Here, we studied the seismic attenuation of the uppermost mantle by measuring the quality factor of the S-n wave (S(n)Q) to understand the dynamics of the lithospheric mantle and the cause of the seismic anomalies found in this area. The upper mantle Q structure has significant lateral differences in Arunachal and the Bhutan Himalaya. Arunachal Himalaya's central region is characterized by a very low Q(<= 150). The successive low-high-low S(n)Q values in eastern Arunachal Himalaya near Siang region have been observed. The western Arunachal region, close to the Bhutan border, exhibits a contrast in Q values. We notice that low Q values (<= 200) predominate in the central to eastern Bhutan Himalaya. The western part of Bhutan Himalaya exhibits relatively high Q(>= 200) values, mostly near Paro and Thimpu. Interestingly, a clear boundary between low and high Q has been observed near Kakthang thrust (KT) in the Bhutan Himalaya. We found significant lateral variation of frequency dependent parameter (eta) across the study region. They range from 0.25 to 0.75, with low values (<= 0.5) found mostly in the central Bhutan Himalaya and in a few isolated areas of the Arunachal Himalaya. Low Q and a relatively higher Q(>= 0.5) might suggest that the scattering attenuation is the controlling mechanism for S-n wave attenuation in the upper mantle beneath Arunachal Himalaya. On the contrary, dominant low Q values across the central segment of the Bhutan Himalaya, along with a low to moderate body wave velocity and dominating low eta values, subsequently corroborate that intrinsic attenuation is the dominant factor in the upper mantle of the central Bhutan Himalaya. |
| 英文关键词 | Seismic attenuation; Seismic tomography; Wave propagation |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001203208200001 |
| 来源期刊 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304993 |
| 作者单位 | Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Kharagpur; Indian Institute of Science Education & Research (IISER) - Bhopal; Council of Scientific & Industrial Research (CSIR) - India; CSIR - National Geophysical Research Institute (NGRI) |
| 推荐引用方式 GB/T 7714 | . 2-D Sn wave attenuation tomography beneath the Eastern Himalaya[J],2024,237(3). |
| APA | (2024).2-D Sn wave attenuation tomography beneath the Eastern Himalaya.GEOPHYSICAL JOURNAL INTERNATIONAL,237(3). |
| MLA | "2-D Sn wave attenuation tomography beneath the Eastern Himalaya".GEOPHYSICAL JOURNAL INTERNATIONAL 237.3(2024). |
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