地壳垂直形变散度场与地震关系初探

PRELIMINARY STUDY ON THE RELATION OF THE DIVERGENCY FIELD DEDUCEDF ROM VERTICAL CRUSTAL DEFORMATION AND EARTHQUAKE

用富里叶级数表示的地壳垂直形变散度计算公式，对华北、南北地震带和河西─祁连山地区的水准资料进行计算，并绘制出各时间段的等值线图。通过对各区的地震活动与地壳垂直形变散度场时空特征的分析，发现绝大多数中强地震的震中位于零散度区或其零值线附近，散度场变化越强，零值区越大，在本时间段或下一时间段内，该区的地震活动性增强。

In this paper, the divergence has been computed by using the precise relevelling data ofNorth China and Hexi -Qilian area, and then mapped the divergency isogram of the area ineach period. The characteristics of earthquake activities and divergency field evolution ineach area have also been analysed thoroughly. It shows that the earthquakes always occur inthe nought divergency region. When there is a large nought divergency region in the area,there is certain strong earthquake in this region.