基于地壳介质各向异性分析乳山地震近场区构造应力特征

利用乳山台阵和乳山台记录的资料，采用剪切波分裂方法分析乳山地区地壳各向异性参数，获得该区域应力环境特征。研究结果显示，乳山地区地壳介质各向异性受到区域构造应力和局部构造活动的双重影响，台站DSDC的快剪切波偏振优势方向近NW方向。结合地震序列展布方向及较大地震震源机制推测，该台附近存在近NW方向的活动断裂，该断裂可能为乳山地震序列的发震断层；台站BSTZ和CXZX的快剪切波偏振优势方向近EW方向，附近可能存在近EW方向的活动断裂。

Tectonic Stress Analysis Based on the Crustal Seismic Anisotropy in Rushan Earthquake Near-Field Region

This paper analyzes the seismic anisotropy parameters in the crust and obtains the characteristics of the stress field. The results show that the characteristics of the seismic anisotropy in Rushan region are influenced by both regional stress and local tectonics. Predominant polarization directions of fast shear-waves at DSDC are nearly NW. Combining the direction of epicenters of earthquake sequence and larger earthquake focal mechanism, it is concluded that the active fault in nearly NW direction is near the DSDC, and may be the possible generating fault of the RSH earthquake sequence. Polarization directions of fast shear-waves at BSTZ and CXZX are nearly EW; thus, there is probably possible active structure in nearly EW direction around the two stations.