非构造型水库地震具有震级小、震源浅、烈度高的特点,研究其烈度衰减对库区地震地质灾害的预测与防治具有重要的意义.根据三峡库首区近年地震实地科考原始烈度资料,选择椭圆衰减模型并对其进行二元回归分析,得到非构造型水库地震的烈度衰减关系.并与原有构造型水库地震烈度衰减关系进行比较.结果可供库区地震危险性分析与地震小区划使用.%Non-tectonic reservoir earthquakes have the characteristics of smaller magnitudes, shallower focus and higher intensities compared with natural earthquakes. The research on the intensity attenuation of non-tectonic reservoir earthquake is important to prediction and prevention of geological hazards caused by earthquake. Using the attenuation data of non-tectonic earthquake in the head region of Three Gorges reservoir in resent years based on the elliptic attenuation model, which is analyzed with bivariate regression method, the seismic intensity attenuation law for non-tectonic reservoir earthquake is presented. The result is compared with the attenuation law of tectonic reservoir earthquake also. The attenuation law can be used for the seismic risk analysis and earthquake resistance designing in reservoir area.
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