青藏高原中部地壳和岩石圈厚度

The Crust and Lithosphere Depth beneath Central Tibet Plateau

摘要: 本文利用近期发展的基于贝叶斯理论的P波接收函数和S波接收函数联合反演方法和INDEPTH IV布设在青藏高原中部的部分台站记录到的远震事件，尝试性的研究了青藏高原中部岩石圈地幔深度的速度结构，得到了研究区地壳和岩石圈厚度在各块体下方的横向变化特征。结果表明，青藏高原中部四个主要构造块体：拉萨地体、羌塘地体、松潘–甘孜地体和柴达木地体在岩石圈地幔深度具有不同的深部结构特征；各块体下方的地壳和岩石圈厚度差别明显；块体交界部位的莫霍面和LAB深度变化尤为剧烈。

Abstract: We have tried to study the lithosphere mantle velocity structure beneath Central Tibet using P-wave and S-wave receiver functions joint inversion technique based on Bayesian theory and teleseismic events recorded by some stations of INDEPTH IV. The lateral distribution of crust and lithosphere depth beneath this study area is obtained. The results show that the four tectonic blocks of central Tibet have different deep structural characteristics. The crust and lithosphere depth are obviously different. The depth values are particularly different beneath the boundary of blocks.