从汶川地震震前现象认识其发震动力应具有的大尺度与深层次性

Based on the phenomena before Wenchuan Earthquake,the characteristic of large scale and deep layer on dynamic force of earthquake occurrence has been recognized

认为汶川地震发震动力具有大尺度与深层次性,并就汶川地震的震前地震活动性进行了分析研究;大小环圆的交切,全球尺度条带的交会,深部地震活动的加强这几项地震活动性图像是汶川地震震前现象的重要特征,这些特征图像在1976年的唐山地震前也有所显示;条带交会,环圆交会,带圆交会处质点运动各异,相互闭锁,质点运动不易解耦,形成应力集中,常常可成为强震发生的场所;深部闭锁活动的特色,在地表观测中易于失察,成为巨大地震更不易预察的一种原因。鉴于巨大地震灾害的严重性,今后在地震预测监测中应加强对大尺度与深层次信息的监测、收集与分析研究。

The characteristic of large scale and deep layer on dynamic force of Wenchuan Earthquake occurrence has been recognized. The seismieity before Wenchuan Earthquake of May 12, 2008 has been studied, by using the data from 1977 to May, 2008. The characteristics, such as intersection between big and small circularities, between strips in globe scale, and earthquake activity enhanced in deep layer, are important phenomena before Wenchuan Earthquake. Such characteristics have already been found in the phenomena before Tangshan Earthquake in 1976. The directions of particle movement at intersections between strips, circularities, and strip and circularity are different from each other and are locked to each other. Since particle movement cannot be easy released, it will make stress concentric and become a location of large earthquake occurrence. The characteristic of lock in deep layer is not easy to find by observation at shallower earth surface, that means some difficult to detect precursor on the great earthquake. Since the disaster of a great earthquake is very serious, it should be enhanced to collect and study on information of large scale and deep layer.