DOI: 10.1016/j.tecto.2021.229025
论文题名: Upper mantle seismic anisotropy beneath the western and central North China Craton
作者: Qiang Z. ; Wu Q. ; Li Y.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 816 语种: 英语
中文关键词: Mantle flow
; Mantle plume
; North China Craton
; Ordos Block
; Seismic anisotropy
; Shear wave splitting
英文关键词: Earthquakes
; Shear waves
; Absolute plate motions
; Broadband station
; Lithospheric deformation
; North China Craton
; Polarization direction
; Seismic anisotropy
; Shear-wave splitting parameters
; Teleseismic earthquakes
; Shear flow
英文摘要: We estimate over 2,000 shear wave splitting parameters from 84 teleseismic earthquakes recorded at 465 temporary broadband stations distributed over the western and central North China Craton to constrain lithospheric deformation and mantle flow. In the interior of the Ordos Block, the W-E trending fast polarization directions with small delay times are indicative of stable terrane, where a thick Archean cratonic keel has been imaged. The dominant W-E fast orientations with relatively large delay times observed in southern Trans-North China Orogen show a systematic directional deviation of ~30° from the absolute plate motion (APM) direction and are explained by a combined effect of APM-induced mantle fabric and a mantle flow around the southeast edges of the Ordos Block. The prominent rift-orthogonal fast orientations beneath rifts to the northern Ordos Block imply the existence of active mantle flow. Also, it is inferred that a mantle plume is responsible for generating the parabolic fast direction pattern beneath the Datong Volcano. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170889
Appears in Collections: 气候变化与战略
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作者单位: Institute of Geophysics, Chinese Earthquake Administration, Beijing, 100081, China; Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
Recommended Citation:
Qiang Z.,Wu Q.,Li Y.. Upper mantle seismic anisotropy beneath the western and central North China Craton[J]. Tectonophysics,2021-01-01,816