利用复测水准资料寻求反映地壳纯形变的定量指标

地壳纯变形分为剪切变形和扩张变形。在前人研究的基础上提出了仅利用复测水准资料求出描述地壳剪切变形和扩张变形指标的方法和步骤，所得的定量指标不受基准的影响，受测量累积误差的影响亦很小，能客观地反映地壳变形的特征。通过理论和实例证明：以一点周围变形分量的最大值代表该点周围垂直面的变形程度比其平均值更能突出变形信息。最后根据实例计算结果分析了剪切变形分量、扩张变形分量与形变速率、构造地震的关系。

SEARCH FOR QUANTITATIVE INDICES TO DESCRIBE CRUSTAL DEFORMATION USING RELEVELING DATA

Crustal pure deformation is divided into both the shear deformation and extension deformation. In this paper,the method and step of calculating the indices which will describe crustal shear deformation and extension deformation by use of releveling data are presented. These quantitative indices are not affected by surveying datum, and the effect of surveying accumulate error is less.So they can describe the feature of crustal deformation objectivly.It is proved that using the maximum of deformation component around a point to describe crustal deformation gradation can make the deformation information more prominent than using the mean values of deformation component. Finally, the relation among component of shear deformation,component of extension deformation and deformation rate and tectonic earthquake is analyzed on the basis of a example.