水库诱发地震的地震动特征

GROUND MOTION CHARACTER OF RESERVOIR EARTHQUAKES

利用新丰江、美国奥洛维尔和蒙蒂赛洛水库地震极近场地面运动资料，研究了水库诱发地震的地震动峰值加速度衰减。结果表明，水库地震的峰值加速度高，衰减快。利用国内水库地震资料研究了水库地震烈度。水库地震烈度与同级天然地震烈度相比，一般是烈度高，衰减慢。水库地震的地震动反应谱频率高。

Based on near field ground motion data of reservoir earthquakes in Xinfengjiang,Oroville,Monticello,etc.,attenuation curves of their peak acceleration have been obtained by using statistical method.The result shows that the peak acceleration of reservoir earthquakes is much higher than that of natural earthquakes.For example,at site one kilometer away from the epicentre,the peak acceleration of a M S 5.0 earthquake at Xinfengjiang is 20 gal higher than that of a natural earthquake with the same magnitude,and that of earthquake in Oroville or Monticello is 100 gal highter than that of natural earthquake. But acceleration of reservoir earthquakes attenuates much faster than that of natural earthquake,and peak period of response spectra and duration of ground motion are rather short.