关键词: 水库地震, 烈度, 衰减模型, 震例

Abstract: Reservoir earthquakes are different from natural earthquakes because of their shallower depth and heavier damage under small magnitude.Therefore,results of damage loss assessment,using traditional models,would be underestimated,the reason of which is that intensity attenuation models for moderate magnitude natural earthquakes could not generate fit intensity especially in near field.Though the research on new attenuation for reservoir induced earthquakes has been carried out for over decades of years in China,there are still not enough cases to support the analysis.To resolve the problem,a proposal in this paper is introduced to search useful materials from amounts of natural earthquakes. We adopt a kind of clustering means,set three classified indices of magnitude,depth and epicenter intensity,and then put all the earthquakes together for classification.After settling the optimal clustering number,some natural earthquakes which could be considered with similar damage to buildings as that in reservoir earthquakes.If we gather enough cases about both types of earthquakes, this method would provide much more materials to regress parameters of attenuation models.At last, this paper shows a set of intensity attenuation curves for reservoir earthquake.While compared with other attenuation models,the new ones are definitely giving a higher intensity and faster attenuation. According to the practical materials' accuracy,new attenuation models should be correct while the magnitude is below M_s6 and the scope of disaster is less than 50 kilometers.

Key words: reservoir earthquake, intensity, attenuation, earthquake case