Study On Activity And Mechanism Of Group Strong Earthquake In China Mainland

The main point of this article is to analysis the characteristics of group earthquake and discuss tectonic mechanism of group strong earthquake pregnant development and occurrence. To Analysis the progress of strong earthquake group occurrence. The research includes the relationship between strong earthquake group and earthquake generic tectonic, the activity of strong earthquake, dynamic environment analysis, tectonic mechanism. It's very important to earthquake tendency prediction, middle-long earthquake prediction, seismic hazard analysis in engineering earthquake research. And it's a main branch of the earthquake research.Because of the zone characteristic of china seismicity is obviously, and in order to build the prediction method based on strong earthquake group, and it can be handled. We used the seismic belt as research unit.We use the result of seismic zoning map and division of seismic block, and determine the research unit of strong earthquake group, analysis the strong earthquake generic tectonic background. Analysis the seismicity of strong earthquake group, because of the difference of background and seismicity in west and east China. So, this article analysis the progress of west and east China strong earthquake group partly. Summarizing the basic rule of China earthquake activity. In the research, this article stands out the level characteristic of strong earthquake, analysis the rule of influence and restriction between strong earthquakes, and summarizes the development of earthquakes.In theory, we mainly discuss why earthquakes occur successively, what is the basic condition when earthquakes successively occur, that is the dynamic source, and analysis the relationship between group earthquakes in the same seismic active period.In appliance, we discuss the method to determine the force and the end of the strong earthquake group, micro-earthquake status change during the strong earthquake group occur.Based on the definition of strong earthquake group, and the analysis the active tectonic data and earthquake data, this article treat seismic belt as statistic unit, divided 13 seismic belt which strong earthquake group occurred, and 78 group, among them, 24 group in east China, S3 group in west China. 626 earthquakes, it's 95% of total number in research region. And Himalaya seismic belt and Taiwan seismic zone are not in the statistic range.Based on the earthquake genrating tectonic and seismisity of the group earthquake, we sorting these earthquake group into three kinds, such as single tectonic style, net tectonic style and intersection tectonic style.