地形变场与现代地壳垂直运动及地震活动关系初探(Ⅰ)——地形变场的计算方法和物理意义

STUDY ON THE EARTH DEFORMATION FIELD AND ITS RELATION WITH CRUSTAL VERTICAL MOVEMENT AND EARTHQUAKE CRUSTAL VERTICAL MOVEMENT AND EARTHQUAKE (Ⅰ)——Numerical expression and physical meaning of deformation field

摘要:

地震与地壳形变有着密切的关系,但台站地倾斜资料空间连续性不好.为此在场分析的基础上,利用逐步订正法将地倾斜观测资料内插到1°×1°的经纬度网格点,引入曲面总曲率的概念计算格点上的Gauss曲率,并推广到格点化的有限区域上得到表征曲面形态和变形强度的地表形变场.结果表明:该方法可以合理地弥补资料不连续的缺陷,并在地表形变场上捕捉到一些关键的地表形变特征,如地凸区、地凹区、鞍形场等.为地震分析和预报中如何拓展和利用大范围时空信息提供了一种有益的思路.

Abstract:

Relationship between earthquake and the earth deformation field is studied based on the viewpoint of field analyses. Deformation fields are obtained by introducing a series of numerical calculation steps in processing ground tilt data. The results show that the methods are capable of making up the shortcomings of the lack of data. Some typical deformation states on the earth surface are well reflected by earth deformation field such as convex/concave areas. The field analyses method also provides a useful idea for how to get and utilize large-scale spatial-temporal information in earthquake observation and prediction.