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青藏高原东北缘地区在地形上处于青藏高原隆起区的东北边缘,青藏高原块体、鄂尔多斯块体和阿拉善块体交汇于此,是整个高原向大陆内部扩展的前缘部位,也是其最新的和正在形成的高原重要组成部分.区域内新生代构造变形和地震活动强烈,是研究青藏高原隆升、构造变形,探讨强地震发生的深部环境的最佳场所.为研究青藏高原东北缘地壳上地幔深部结构构造特征,近些年来开展了大量的地球物理探测工作.笔者收集了近三十年来在青藏高原东北缘展开的人工地震和天然地震观测工作,综合论述了人工源地震探测方法和天然地震成像方法(主要包括接收函数方法、地震层析成像方法、SKS剪切波分裂分析等)的发展和不同地震探测方法所取得的关于青藏高原东北缘壳幔速度结构、莫霍面形态、地壳上地幔各向异性研究等所取得的成果,总结分析了青藏高原东北缘地壳上地幔结构特征方面已达成的的一致观点以及有待进步一研究之处,并对比分析了不同方法之间的差异之处.
The northeastern margin of the Qinghai-Tibet Plateau is located on the northeastern edge of the uplift of the Qinghai-Tibet Plateau in terms of its terrain. The Qinghai-Tibet Plateau, the Ordos block and the Alxesian block intersect here, forming the frontal extension of the entire plateau to the interior of the mainland and the latest And is forming an important part of the plateau.The Cenozoic tectonic deformation and seismic activity is strong in the region, is to study the uplift of Qinghai-Tibet Plateau, tectonic deformation, to explore the deep earthquake occurred in the best place .To study the northeastern margin of the Tibetan Plateau crust In recent thirty years, a great deal of geophysical exploration has been carried out.The authors collected the artificial earthquakes and natural seismic observations carried out in the northeastern margin of the Qinghai-Tibet Plateau over the past 30 years, and summarized the synthetic methods of artificial source seismic exploration and natural The development of seismic imaging methods (including receiver function method, seismic tomography method, SKS shear-wave splitting analysis, etc.) and the results of different seismic exploration methods on the crust-mantle velocity structure, Moho morphology, crust Upper mantle anisotropy and other achievements made, summarizes and analyzes the northeast of the Qinghai-Tibet Plateau The consistent view reached in the structural features of the margin crust and the upper mantle and the areas to be further improved and the differences between different methods have been compared and analyzed.