The Earthquake Shock Integrated Formation Model

At 2:28 p.m. on May 12, 2008, in the Central Region of China's Sichuan Province,it occurred an earthquake that the main shock is Ms8.0-level. As one of the major earthquake zone,the Longmenshan tectonic belt is the largest steepness gradient zone in China and the global terrain. There are many high mountains and canyons which is the distribution of many rivers in Upper reaches of the Yangtze River. In these special physiographic and geological conditions, Earthquakes in Wenchuan are significantly different from other strong earthquakes in China. WenChuan Earthquake triggered a large number of slopes geologic body events which caused heavy casualties and huge property losses, for instance landslides, collapses, debris flow, etc.This article describes the causes of WenChuan Earthquake, type, intensity distribution, and the type and distribution of the secondary geologic body events that formed. Found in a large number of geologic body events, there is a new class of hazards geological body event that different from the previous study. As a result that its trigger mechanism is closely related with the earthquake, therefore named the "Seismic geologic body'With the deep analysis of the two examples of Seismic geologic body, the Xiejiadianzi of Longmenshan Town and Niujuan ditch-Lianhuaxin ditch of of Wenchuan County of the Aba Tibetan and Qiang Autonomous Prefecturre, the article makes detailed analyses of theirs geologic features and disaster phenomena, and they are accompanied by a large number of pictures shows. Finally, it makes a detailed comparison among geologic characteristics, geography and land features, situation of the disaster phenomena. Compared to other geologic disasters, the unique features of that "integrated earthquake" are found that it happens in the place where are the lush hillsides of vegetation, not existing lumbering phenomenon and stable slope; the whole process of the performance as "the earth's surface to bloom", activatory debris flow along the bedrock slopes down and buries the valley, then in the end part of the arch formed to flowering.In the case of this special class of sedimentary body, such as Xiejiadianzi and Niujuan ditch-Lianhuaxin ditch which are induced by the earthquake, this article discusses the definition of "Seismic geologic body" detailed makes a in-depth description and analysis for its characters.Having studied phenomena of Seismic geologic body and defined the Seismic geologic body, then this article analyzes its formation mechanism from three aspects that the material basis for the formation of integrated shock dynamic conditions, natural conditions:Material basis includes two parts of debris flow and liquefaction of sand; dynamic conditions contains both the Class liquid laminar flow of scraping debris flow and the driving force of spray; natural conditions covering relations between the topography and earthquake (magnitude, intensity), then from the two aspect of the relationship with the slope and fault, it reveals the fracture-developed zones of Seismic geologic body. Afterwards, combining examples of and its formation mechanism, it further studies the plane, profile distribution, migration characteristics and physical properties of Seismic geologic body.Besides, Combined with strong force in the middle latitude, the article makes a brief explanation of the mechanism of Beichuan-Yingxiu dextral strike-slip fault.Finally, it introduces the important practical significance of Seismic geologic body studying:by the application of integrated earthquake's formation mechanisms and formation pattern to explain the Seismic unconformity and Seismites sequence; discussion about geological significance of the Seismic geologic body study for ancient earthquakes and oil and gas exploration; its implications of the earthquake disaster reduction.