【摘要】 对松辽盆地的构造环境、演化历史和盆地的成因机制进行了分析,认为松辽盆地主要是在中国东北前中生代这一特殊的大地构造背景下由简单剪切作用形成的,根据中浅层构造和地层特点,可将松辽盆地划分为6个一级构造单元和31个二级构造单元。在此基础上,对东北地区中强浅源地震进行了期幕分析,结果表明东北地区浅源地震具有20年活动的周期特征,1900年以来可以分为5个活动期,目前正处于第5个活动期的末期(1999—2010年),未来几年东北地区仍有可能发生1~2次中强地震。根据地震活动特点和松辽盆地内部中强地震成对特征,位于内蒙古呼伦贝尔及邻区将是可能的发震区域。更多还原

【Abstract】 Structural environment,evolutional history and the formation mechanism of Songliao basin are analyzed in this paper.It shows that Songliao basin was formed by means of simple cutting on the especial structural background in Northeast China region in Mesozoic.Songliao basin is divided into 6 first grade structure cells and 31 second grade structure cells based on the characteristics of shallow tectonics.On the other hand,we analyzed time characteristics of shallow focus earthquakes in this area,the results show that there is a periodic feature of 20 years,and divided into 5 activity periods.Now it is in the late stage of the fifth activity period(1999—2010),1~2 strong earthquakes in the future may occur.Based on characteristics of seismic activity,and earthquake occurrence in pair in Songliao basin,the Hulun Buir of Inner Mongolia and the neighboring area will be risky regions.更多还原