【摘要】 利用中国大陆东部２１个台站的４３条面波大圆路径上瑞利面波记录的双台资料， 计算出双台间地震面波相速度频散，采用Ｔａｒａｎｔｏｌａ概率反演的方法求得相速度频散曲线的分 布，并由各处相速度频散曲线反演得到地壳上地幔的三维横波波速图像，进而得到中国东部 地壳上地幔的Ｓ波速度结构．结果表明：我国大陆东部地壳厚度总体上呈东薄西厚的趋势，以 １０５°Ｅ为界向西地壳厚度逐渐加深到５５ｋｍ以上，其中有一个北东向的ｈ形地壳厚度的坡度 带．豫西及晋南地区为相对薄地壳的地区．大别山地区和泰山附近地区地壳变厚，但秦岭地 区地壳不变厚．上地幔低速层上界面的深度在华北地区较浅，为８０—９０ｋｍ，在鄂尔多斯、四 川东部以及黔湘地区为１２０—１３０ｋｍ．扬子地块东部及华南褶皱系中、东部上地幔顶部速度 偏低使低速层的速度反差不明显．滇黔褶皱系的西部在２００ｋｍ以内的上地幔中未出现低速层。更多还原

【Abstract】 The phase velocity dispersion of seismic surface waves have been calculated on the basis of clear and reliable Rayleigh wave records of the 21 seismic stations and 43 paths in east continental China. A distribution of phase velocity dispersion is obtained by Talantola probability inverse method. The image of the distribution of 3-D shear wave velocity in the crust and mantle is inverted by the phase velocity dispersion curves in the researched area. Then we obtain the S velocity structure in the cruse and mantle of east continental China. The results show that the overall tendency of the thickness of east China crust is thin in the east and thick in the west. To the west of 105°E, thickness of the crust gradually increases to 55km. There is an ’h’ form slope belt of the crust thickness. The crust is relatively thin in west Henan province and south Shanxi province. The thickness of the crust beneath Dabie mountain and Tat mountain is thicker than surrounding area. But the crust is not thicker beneath Qin mountain (Qinlin). In North China the top interface of the low velocity layer of the upper mantle is rather shallow. It is about 80-90km. In the area of Eerduosi depression, Sichuan syneclise and Guizhou-Hunan area it is about 120- 130km. In the east Yangtze block as well as middle and South China Folding System velocity in the top upper mantle is relatively low and the velocity contrast of low velocity layer is not evident. In the west of Yunnan--Guizhou folding system there is no low velocity layer within the top 200km of the upper mantle.更多还原