| 青藏高原东北部天然地震探测与岩石圈深部特征 |
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| 关键词:Indian plate main strain seismic tomography velocity perturbation |
| 基金项目:国土资源部重点基础项目“阿尔金祁连山的构造演化及岩石圈剪切作用”(国土资源部,1996年[9501106]号) |
| 作者 | 单位 | | 薛光琦 | 中国地质科学院矿产资源研究所，北京100037 | | 钱辉 | 中国地质科学院矿产资源研究所，北京100037 | | 姜枚 | 中国地质科学院矿产资源研究所，北京100037 | | 宿和平 | 中国地质科学院矿产资源研究所，北京100037 | | 董英君 | 中国地质科学院矿产资源研究所，北京100037 | | Gerard Wittlinger | Eost, 5 rue Rene Descartes, 67084, Strasbourg, France | | Jerome Vergne | Eost, 5 rue Rene Descartes, 67084, Strasbourg, France | | Georges Poupinet | LGIT-IRIGM, University Joseph Fourier.BP53X.38041 Grenoble, France |
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| 摘要: |
| Studies on the Velocity Structure of Crust-Upper Mantle beneath Northeast Qinghai-Tibet Plateau, China |
| To better understand the driving mechanism in depth controlling deformation across the blocks in the northeast part of the Qinghai-Tibetan Plateau, the authors gave some tomographic analysis on the teleseismic data recorded in the area, and the results on receiver function and anisotropy of the same area are discussed in combination. The ACH basics is introduced. It is suggested that the Kunlun orogeny, driven by the continuing northward movement of the Indian plate,is induced underthrust northeastward beneath the Qaidam basin, and a south-dipping ramp is observed in the upper mantle under the Bayan Har block. Low velocity zones (LVZ) in the upper mantle appear well defined to the north of Animaqin Suture, reaching as deep as 300 km. The LVZs are presumably associated with the shearing at a deeper level of Kunlun fault. The velocity image reveals that Moho deepens southward in the study area, which is in consistency with the lithospheric thinning trend in the northeastern Tibetan Plateau. This is believed to be the so-called Remote Effect of the northward motion of India. In addition, the tomographic and anisotropic analysis seems to support the arguement that the main strain turns from northward to northeastward in the northeastern Tibetan Plateau. |
| XUE Guang-qi,QIAN Hui,JIANG Mei,SU He-ping,DONG Ying-jun,Gerard Wittlinger,Jerome Vergne,Georges Poupinet.2003.Studies on the Velocity Structure of Crust-Upper Mantle beneath Northeast Qinghai-Tibet Plateau, China[J].Acta Geoscientica Sinica,24(1):19-26. |
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