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3-D lithospheric structure of upper mantle beneath Ordos region from Rayleigh-wave tomography
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|Authors:||Li Duo; Zhou Shiyong; Chen Yongshun; Feng Yongge; Li Peng|
|Author Affiliations:||Primary: |
Peking University, School of Earth and Space Science, Beijing, China
|Volume Title:||Diqiu Wulixue Bao Acta Geophysica Sinica|
|Source:||Diqiu Wulixue Bao = Acta Geophysica Sinica, 55(5), p.1613-1623. Publisher: Science Press, Beijing, China. ISSN: 0001-5733|
|Note:||In Chinese with English summary. 45 refs.; illus.|
|Summary:||We apply two-plane-wave tomography, which takes the influences of a non-plane wave field into consideration, to study the velocity structure of the upper mantle lithosphere in the Ordos region. The data source consists of two parts: one is from 69 broad-band seismographs of the China Earthquake Networks Center, and the other is from 34 mobile digital broad-band seismographs of the PKU. Over short periods, most of the high and low velocity anomalies correlate well with surface geological features. Differences in the structure of the upper mantle lithosphere are revealed by long-period surface waves. We extract the 3D structure of shear velocity anomalies at 200 km depths from the Rayleigh wave phase velocities. The results reveal that the Ordos block has a high velocity beyond 200 km deep, and no evidence for reactivation. There is a fierce interaction between the Ordos and Tibet blocks at the southwestern edge of the Ordos block, which causes the upper mantle flow there. Upwelling beneath the central zone may be caused by the subduction of both the Pacific and Indian plates.|
|Subjects:||Continental lithosphere; Elastic waves; Guided waves; Lithosphere; Mantle; Rayleigh waves; Seismic waves; Surface waves; Tomography; Upper mantle; Velocity structure; Asia; China; Far East; North China Platform; Ordos Basin|
|Copyright Information:||GeoRef, Copyright 2020 American Geosciences Institute.|
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