甘东南至陕甘宁交界中强震危险区地震活动能量场时空特征

Space-time Distribution Characteristics of Energy Field of Seismic Activity for the Southeastern Part of Gansu Province to Shanxi--GansumNingxia Boundary Region Moderate-strong Earthquake Hazard Area

摘要:

运用随机函数理论将甘东南至陕甘宁交界地区的地震活动能量场看作时间和空间的随机函数,用自然正交函数展开方法,系统研究主要典型能量场的时间权重系数变化曲线以及典型能量场的空间等值线图。结果发现,目标曲线较大幅度的升、降变化预示了可能发生中强地震的时间段,而等值线图的高值变化对应了可能发生中强地震的区域。

Abstract:

Using the random function theory, taking seismic energy field in the southeastern part of Gansu province to Shanxi-Gansu-Ningxia boundary region as the random function of space and time, the time ＂weight＂ coefficients and the isogram charts of first several typical fields in the region are studied by the method of natural orthogonal function expansion. The result shows that the time coefficient curves upward and downward changes with large amplitude often meaning the moderate-strong earthquake is going up, while the high values of isogram give the region of earthqake hazard.