按新的水库诱发地震分类探讨长江三峡水库诱发地震的可能性  

INVESTIGATION OF POSSIBILITY OF RESERVOIR-INDUCED EA RTHQUAKE IN THE YANGTZE GORGES UNDER NEW CLASSIFICATION

作　　者：刘忠书[1] 韩晓光[1] 龚平[1] 

机构地区：[1]国家地震局地震研究所

出　　处：《地壳形变与地震》1995年第2期51-58,共8页Crustal Deformation and Earthquake

基　　金：国家科委"七五"攻关项目

摘　　要：提出了一种新的水库诱发地震分类方法，将水库地震分为断裂活动型、崩滑塌陷型、膨胀破裂型和岩溶气爆型四大类共十个亚类。指出评价水库诱发地震的危险性实际上主要是评估诱发断裂活动型水库强震的可能性。在分析了长江三峡水库区水库诱发强震的地质条件之后，按照上述观点着重分析了水库诱发断裂活动型强震的可能性。得出的基本结论是：对整个长江三峡水库区而言，水库诱发地震的最大震级不会超过５．５级；倘若仅就库首区而论，水库诱发地震的最大震级则不会超过５．０级；水库诱发地震对三峡大坝坝址的影响烈度不会超过Ⅵ度。In this paper a new classification of reservoir-induced earthquakes is presented by which reservoir-induced earthquakes are classified into four types: fault action type, slide-slumping type, expand -rupturing type and Karst air exploding type, and there are ten subtypes. It is indicated that in practice assessing the risk of reservoir-induced earthquake is mainly evaluating the possiblity of strong reservoir-induced earthquake of fault action type.After analysing geological conditions of strong reservoir-induced earthquake in Yangtze-Gorses Reservoir region the p<issibility of strong earthquake of fault action type emphatically analysed accordins to above viewpoint. The basic conclusion is that in whole Yangtze-Gorges Reservoir region the maximum magnitude of reservoir-induced earthquake may not be over 5. 5; If just in the reservoir head area it may not be over 5.0. In a word, the influence intensity of reservoir-induced earthuqake upon the dam site at Shandouping may not be over the Ⅵ.

关 键 词：地震 类型 地震强度 长江三峡 水库诱发地震 

分 类 号：P315.1[天文地球—地震学]