Abstract: This paper deals with indicators of topographical deformation. They are the changing values of vertical velocity per unit distance along the horizonal direction on the sur-facial deformation field in which crustal vertical movement is dominant. Taking seismi-cal risk zoning in the North China as an example, the author considers that the determined indicators can be provided as a useful quantitative basis for forecasting future earthquakes.

Key words: Topographical deformation ratio, Degree of seismic risk, Seismic zonation in North China

摘要： 该文讨论地变率指标的概念。它是指在由发震构造引起的垂直运动为主的地表形变场中,水平方向上单位距离内垂向速率变化的物理量。笔者以华北地震区划为例,认为它可作为预测未来震情的一种有效的定量依据。

关键词: 地变率, 地震危险度, 华北地震区划