| 藏北低速体存在的地震学证据——INDEPTH4宽频地震结果 |
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| 关键词:Central Kunlun Fault seismic tomography low-velocity body INDEPTH-IV |
| 基金项目:中国地质调查局项目“青藏高原深部结构探测与地壳活动特征”(编号: 1212010511809); 美国自然科学基金委员会(NSF); 德国GFZ地学研究中心 |
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| Seismological Evidence for the Existence of the Low-velocity Body in Northern Tibet: A Result from INDEPTH-IV Based Broad-Band Seismological Study |
| The INDEPTH-IV seismic profile, located in northeastern Qinghai-Tibetan Plateau, starts at the north end of Qaidam Basin, extends across East Kunlun Fault Zone, Jinsha Suture, and ends at Qiangtang Terrain. The authors implemented a 3-D travel-time residual reversion using body-wave from the natural earthquake, and outlined the pattern of the deep-seated structure underneath the northeast part of the Qinghai-Tibetan Plateau. The most notable phenomenon in the area of interest is the existence of low-velocity bodies distributed between the lower-crust and the upper-mantle beneath the Kunlun Terrain, Hoh Xil Terrain and the north part of Qiangtang Terrain, probably related to the hot mantle material derived from the collision between the northward thrusting Indian Plate and southward moving Eurasian Plate. The result obviously indicates that the South Kunlun Fault, Central Kunlun Fault and Jinshajiang Fault are all southward thrusting. It is then presumed that the upper -mantle beneath the Qaidam Basin is rigid, where there is no exchange of hot material. |
| XUE Guang-qi,ZHAO Wen-jin,SU He-ping,QIAN Hui,FENG Mei,James Mechie.2011.Seismological Evidence for the Existence of the Low-velocity Body in Northern Tibet: A Result from INDEPTH-IV Based Broad-Band Seismological Study[J].Acta Geoscientica Sinica,32(3):331-335. |
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