内蒙古阿巴嘎地区地壳方位各向异性研究

本文利用架设在内蒙古阿巴嘎地区38个宽频带地震台站记录到的远震数据，通过拟合P波接收函数径向Pms转换波到时和叠加不同方位切向分量，确定了地壳各向异性参数.结果表明，大部分台站Pms延迟时间在0.35 s左右；而少数台站时差较大，推测可能受到索伦缝合带附近地壳残留倾斜界面影响.各向异性快波方向变化范围在N95°E到N180°E之间，平均为N130.6°E±19.1°，推测中下地壳矿物在ENE-WSW向区域主压应力作用下发生晶格定向排列可能是导致地壳各向异性的主要成因.研究区壳幔变形特征和机制不同，属于解耦变形.

Crustal azimuthal anisotropy beneath Abag area in Inner Mongolia,China

Utilizing the teleseismic data recorded by 38 broadband seismic stations located in the Abag area, the crustal anisotropy parameters are obtained by the radial Pms phase fitting and tangential component stacking of the P wave receiver functions. The results show that the delay time of most stations is about 0.35 s; while a few stations have larger-than-normal delay times, which is inferred to be affected by the residual inclined interfaces in the crust near the Solonker suture zone. The fast directions vary from N95°E to N180°E with an average value of N130.6°E±19.1°, inferred to be formed by lattice-preferred orientation of the middle and lower crust anisotropic minerals under regional stress. The deformation mechanism of the crust and mantle are different, and is decoupled.