上海及其邻近地区三维地壳结构层析成像

利用上海及其邻近地区地震台网的地震记录及人工爆破资料,采用地震层析成像方法反演研究区地壳三维P波、S波速度结构模型。成像结果表明:不同深度的P波、S波速度扰动呈北西向展布特征;地震大多数分布在低速区的块体内,说明地震不仅与断裂活动有关,有可能还与物质结构和性质有关;上海及其邻近地区上地壳速度结构,断裂活动和物质性质三者之间存在密切关系。

Seismic Tomography Inversion of 3-D Crust Structure in Shanghai and Adjacent Areas

Using the local seismic events which were recorded by seismic networks of Shanghai and it's adjacent areas and some artificial blasting events,adopting seismic tomography method,the 3-D P,S wave crust velocity structure of this region is inversed.The tomographic images in different depths show that the P,S wave velocity perturbation orientates NW direction.Most of local earthquakes occurred in low velocity zones,it indicates that earthquake activity is not only related to active faults and maybe linked to crustal structure and its material property.There is a close relationship among velocity structure,active faults and upper crustal materials in Shanghai and its adjacent areas.