中国东部地壳与上地幔速度不均匀性和各向异性的初步研究(英文)  

Lateral Heterogeneity and Anisotropy of Crust and Upper Mantle in Eastern China

作　　者：傅淑芳[1] 曾燕青 

机构地区：[1]北京大学地球物理系,100871

出　　处：《CT理论与应用研究（中英文）》1993年第1期42-46,共5页Computerized Tomography Theory and Applications

摘　　要：本文利用763式地震仪记录的地震瑞利面波资料,用双台法计算出瑞利面波的频散曲线,从而得到相速度.将我国东部地区(99.8°—123.8°E,20°—44°N)分成4°×4°大小的方格,利用代数重建法得出该地区上地幔与地壳的横向不均匀性.对同一地区再进行一次分块,块的大小为8°×8°,考虑到各向异性对面波相速度的影响,利用周期为60 s 的面波相速度资料,反演出我国东部的横向不均匀和各异向性的特征。Using the data of Rayleigh wave recorded by 763 type of seismograph,the phasevelocities were obtained by a two-station method.The area of Eastern China,99.8°—123.8°E and20°—44°N,was divided into 4°×4°and 8°×8°blocks.The distribution of velocities at the periodsof 28s,40s and 60s was reconstructed by ART.The lateral heterogeneity and azimuthalanisotropy of the upper mantle were inverted by analysing Rayleigh wave phase vel///////////////ocity at the peri-od of 60 s. The inversion results indicate that the velocities of Southwestern and Northern China arelower than the average velocities of the studied area, and the velocities in Souihern China are higherthan the average velocities at the periods of 28 s, 40 s and 60 s. The anisotropy result is unsatisfiedbecause of the error in data.

关 键 词：各向异性 上地幔 横向不均匀性 

分 类 号：P315[天文地球—地震学]