摘要
采用水位滑动变差方法，研究了唐山地震前后地下水位时空演化特征。研究结果表明，水位滑动变差方法是突出地下水位前兆场时空演化特征的良好方法。唐山地震前后地下水位动态图像正负区和异常特征区的时空演化具有明显的规律性和阶段性。负值区的演化具有“收缩—扩展—急速扩展—发震”的特征；异常特征区的演化显示“迁移—扩展—稳定—发震—消失”的特征；滑动变差显示”增大—减小—发震—急速减小”的变化过程。据此给出了地震中短期预报新标志。
he characteristics of time-space evolution of groundwater level before and after Tangshan earthquake have been studied by sliding variation extent method. The results show that sliding variation extent method can be used to identify the anomaly changes of groundwater level. The positive and negative regions and anomaly characteristic region of sliding variation extent of groundwater level in Tangshan earthquake present distinct features of stage and regularity before and after the earthquake. The negative region shows the feature of “contraction - extension - rapid extension - earthquake-occurring'. The anomaly characteristic region displays the feature of “migration - extension - stabilization - earthquake-occurring - disappearance'. The sliding variation extent of groundwater level in the anomaly characteristic region presents the feature of “increase - decrease - earthquake-occurring - rapid decrease'. Based on the features described above, a new index for medium-short term prediction has been suggested in the paper.
出处
《地震研究》
CSCD
北大核心
1998年第2期153-159,共7页
Journal of Seismological Research
关键词
地震预报
地下水位异常
地震
唐山市
水位图像
earthquake prediction, groundwater level anomaly, Tangshan earthquake
