论文部分内容阅读
After Geng Qingguo proposed the relationship between drought and earthquake,more and more people pay attention to the law of the time distribution of the various disasters and their relationship.On the basis of the drought-earthquake relationship,scholars have proposed a further disaster chain structure that is drought-flood-earthquake.Before the Wenchuan earthquake happened,the eastern Tibetan Plateau had been occurred several rare serious natural disasters,including Southwest drought of the year 2002 and 2006,Sichuan floods in mid-2007 and southern snow disaster in early 2008.These natural disasters should not be separate and distinct point of view,they should be seen as a droughts-flood-earthquake disaster chain of Wenchuan earthquake.Through the literature review,the geophysical data show that the Tibetan Plateau has its crustal low velocity low resistivity layer,that is to say that there exist the flowing lower crust.The disasters above may be generating from the hot flowing material of the lower crust the blocked by the Sichuan Basin.This paper attempts to combine the previous data and theory,and summarize the structure and characteristics of the chain of disasters.We set Wenchuan earthquake for example to discussed and analyzed the disaster chain of drought-flood-Earthquakes and discuss its reason.