Abstract: According to analysis of disaster information feedbacks from previous destructive earthquakes,and combined with evolution mechanism and distribution characteristics of earthquake disasters,we put forward three methods for fast assessing seismic intensity distribution based on discrete disaster information.In addition,considering the calculation principle,data base,characteristics and determination results,the three methods could be applied in different scenarios.The simple and easy Tyson-polygon method is can be used during the initial period of earthquake emergency in which little disaster information is acquired roughly,and needs to be combined with influences of earthquake source,rupture process and terrain conditions on damage distribution for obtaining relatively reasonable disaster distribution assessment result.The Kriging-interpolation method,which is a spatial interpolation method based on geo-statistics,has strict requirements on data distribution, and its result is better in assessing the disaster scope and can be used as a reference of disaster assessment correction and emergency decision-making after comprehensive adjusting with seismic rupture process and the earthquake aftershock distribution when a certain amount of disaster information is acquired whereas the disaster situation is not clear.The ellipse fitting by distance standard deviation method is based on the hypothesis that seismic intensity distribution is oval,sensitive to data and can be used for fitting disaster information with high credibility or reported from professional source,and its result can be used as a reference of disaster field investigation and evaluation of earthquake intensity distribution.

Key words: Seismic intensity distribution, Earthquake disaster information, Spatial interpolation