唐山地震前兆的时空演化及中短期标志

本对唐山地震前形变场、应力应变场、重磁电变化场、地下流体变化场的空间分布及时间演化进行了系统分析，探讨了前兆空间分布与构造环境的内在关系、各类前兆出现顺序与孕震环境的内在关系，以及各类前兆的相关性；在综合大量前兆时间演化特征的基础上提出了唐山地震中短临过渡指标，为研究有关地震前兆图象分布规律及提取前兆判据提供了一定依据。

TIME SPACE EVOLUTION AND MEDIUM SHORT TERM SYMBOL OF THE PRECUSOURS FOR THE TANGSHAN EARTHQUAKE

Systematic analysis on space distribution and time evolution of deformation field, stress and strain field, gravity, geomagnetic and geoelectric field and underground fluid field is made; internal relations between space distribution of precursors and tectonic environments as well as occurrence sequence of precursors and seismogenis environments are studied and medium short impending transition indexes for the Tangshan earthquake are put forward on the basis of synthesizing evolutional characteristics of precursor time, which has provided some basis for studying distribution law of precursor patterns and extracting precursor criteria