| DOI: | 10.1016/j.tecto.2019.228245
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| 论文题名: | Crustal structure of western Tibet revealed by Lg attenuation tomography |
| 作者: | Jaiswal N.; Singh C.; Singh A.
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| 刊名: | Tectonophysics
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| ISSN: | 00401951
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| 出版年: | 2020
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| 卷: | 775 | | 语种: | 英语
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| 中文关键词: | crustal partial melting
; Crustal structure
; Lg-wave
; Q-tomography
; Seismic attenuation
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| 英文关键词: | Structural geology
; Tomography
; Attenuation properties
; Attenuation tomography
; Crustal structure
; Factor decompositions
; Partial melting
; Regional earthquakes
; Seismic attenuation
; Surrounding regions
; Earthquakes
; crustal structure
; Lg-wave
; partial melting
; seismic attenuation
; seismic migration
; seismogram
; tomography
; China
; Xizang
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| 英文摘要: | The lateral Lg wave attenuation in western Tibet and surrounding regions is studied. A total of 706 Two-station method (TSM) and 533 Reverse two-station method (RTSM) pairs are generated from 282 regional earthquakes. The earthquakes are recorded at 48 seismic stations operated across western Kunlun and western Tibet regions. The Lg phases are extracted from the vertical component of seismograms with magnitude greater than 4.6 mb and focal depth less than 50 km to measure the TSM and RTSM Lg Q at 1 Hz (Q0). The LgQ0 tomography map is generated with grid-size 0.5∘ × 0.5∘ using the least-squares orthogonal factor decomposition (LSQR) algorithm. Lateral variation of Lg attenuation is found to exist across the region. The results provide new insights into the attenuation properties of the crust and its linkage with regional geodynamics. The low LgQ0 < 50 values are observed in TSM image along the Kunlun Suture, Tinashuihai terrane and in some pockets of north western side of the Lhasa terrane. The high LgQ0 > 200 is revealed in the central part of Lhasa terrane in western Tibet from both TSM and RTSM images. The high LgQ0 values complemented with the high Pn velocities beneath the central part of Lhasa terrane reveal the trace of underthrusting Indian lithosphere beneath the western Tibet. © 2019 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/170612
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| Appears in Collections: | 气候变化与战略
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作者单位: | Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, India
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| Recommended Citation: | |
Jaiswal N.,Singh C.,Singh A.. Crustal structure of western Tibet revealed by Lg attenuation tomography[J]. Tectonophysics,2020-01-01,775
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