一、引言过去,人类对 P 波速度各向异性地壳模型的研究,成功地模拟了 P 波在地壳中的传播性质。最近几年,在称之为通讯革命的新技术迅速发展的前提下,人类得以用足够高的采样速率来获取 S 波在地壳中传播的三分量数字记录。通过对这些数字记录的分析,可揭示裂纹-应力几何图像的许多特征。自1984年以来,监测到地壳内 S 波分裂的有关报道陆续得到发表,1985年3篇,1986年30篇,一年就增加了10倍。从这种增长速度看,1987年英国地质调查所的布思和克兰平(D.C.Booth & S.Cram- I. INTRODUCTION In the past, the human study of the P-wave velocity anisotropic crust model successfully simulated the P-wave propagation in the crust. In recent years, with the rapid development of new technologies known as the communications revolution, humans have been able to access three-component digital records of the S wave propagating in the crust at a sufficiently high sampling rate. Analysis of these digital records reveals many of the features of crack-stress geometry. Since 1984, reports of S-wave fission monitoring in the crust have been published one after another, 3 in 1985 and 30 in 1986, a 10-fold increase in one year. From this rate of growth, the British Geological Survey 1987 Booth and Cran flat (D.C.Booth & S.Cram-