| L ateral Variation of Pn velocity beneath northeastern marginal region of Qinghai—Xizang plateau |
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| 引用本文： | 许忠淮,汪素云,裴顺平.L ateral Variation of Pn velocity beneath northeastern marginal region of Qinghai—Xizang plateau[J].地震学报(英文版),2003,16(1):26-33. |
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| 作者姓名： | 许忠淮 汪素云 裴顺平 |
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| 作者单位： | InstituteofGeophysics,ChinaSeismologicalBureau,Beijing100081,China |
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| 基金项目： | State Key Basic Research Project Development and Programming Mechanism and Prediction of Continental Strong Earthquakes (G19980407)，State National Science Foundation of China (49732090). |
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| 摘 要： | Pn arrival time data are collected from the bulletins of both national and regional seismological network in China-These data are tomographically inverted to map the lateral variation and anisotropy of Pn velocity in the northeast-ern marginal region of Qinghai-Xizang plateau.The average Pn velocity in this region is 8.09km/s,being a little higher than the average for whole China,Higher velocity is found in tectonically stable Qaidam basin,while lower velocity is seen in and around tectonically active Shanxi graben.The region where the 1920 Haiyuan great earth-quake occurred shows a slightly low Pn velocity.A noticeable result is that,differing from the tectonically com-pressive Tianshan region.where Pn velocity is low,the Qilianshan region,where the Neotectonic deformation is also primarily compressive,shows high Pn velocity,In the uppermost mantle beneath the Ordos plateau Pn veloc-ity is inhomogeneous,varying from higher velocity in southwestern part to lower one in northeastern part.This may be attributed to possible movement of the Ordos block,as there are strong earthquakes all around the block.
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| 关 键 词： | 青藏高原 上地幔 P波速度 构造运动 地震活动 |
| 收稿时间： | 25 February 2002 |
| 修稿时间： | 27 May 2002 |
Lateral variation of Pn velocity beneath northeastern marginal region of Qinghai-Xizang plateau |
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| Xu Zhong-huai , Wang Su-yun and Pei Shun-ping.Lateral variation of Pn velocity beneath northeastern marginal region of Qinghai-Xizang plateau[J].Acta Seismologica Sinica(English Edition),2003,16(1):26-33. |
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| Authors: | Xu Zhong-huai Wang Su-yun and Pei Shun-ping |
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| Institution: | Institute of Geophysics, China Seismological Bureau, Beijing 100081, China |
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| Abstract: | Pn arrival time data are collected from the bulletins of both national and regional seismological network in China. These data are tomographically inverted to map the lateral variation and anisotropy of Pn velocity in the northeast-ern marginal region of Qinghai-Xizang plateau. The average Pn velocity in this region is 8.09 km/s, being a little higher than the average for whole China. Higher velocity is found in tectonically stable Qaidam basin, while lower velocity is seen in and around tectonically active Shanxi graben. The region where the 1920 Haiyuan great earth-quake occurred shows a slightly low Pn velocity. A noticeable result is that, differing from the tectonically com-pressive Tianshan region, where Pn velocity is low, the Qilianshan region, where the Neotectonic deformation is also primarily compressive, shows high Pn velocity. In the uppermost mantle beneath the Ordos plateau Pn veloc-ity is inhomogeneous, varying from higher velocity in southwestern part to lower one in northeastern part. This may be attributed to possible movement of the Ordos block, as there are strong earthquakes all around the block. |
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| Keywords: | Pn tomography northeastern Qinghai-Xizang plateau |
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