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地球学报  2001 

青藏高原及其部分邻区地震各向异性和土地幔特征

Keywords: 青藏高原,各向异性,上地幔

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Abstract:

通过研究在青藏高原及其部分邻区由三分量宽频地震资料获得的剪切波各向异性的特征,得出了上地幔构造的若干认识,在本区200km以上的上地幔范围内各向异性的方向性变化主要是上地幔物质运移方向的影响,各地体的岩石圈与地壳在相当长时间内是连贯的运移,各向异性的主要方向决定于上地幔承受的主应力剪切作用方向常常与地表的山系和构造方向不一致,最强的各向异性特征出现在高速体地体边缘,与深部热的地幔物质有关,在各地体边缘的走滑断裂附近各向异性与断裂带走向一致。

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