摘要
本文在前人对水库诱发地震规律的研究基础上,综合分析了三峡地区1980年以来ML2级及以上地震的震例资料,对比分析了三峡水库蓄水前后震源在空间分布上的变化规律和地震频度变化的因果问题。结果认为,相对于蓄水前,蓄水后震源深度没有明显加深,震源位置有向库区集中的趋势。蓄水后地震年平均释放能量有一定的增强,能量增强的原因主要是地震频度的增加导致。
This paper comprehensively analyzes the data collected from the earthquakes with magnitudes of ML2 and larger since 1980 in the Three Gorges area.A comparison is made of the spatial variation in the epicenters before and after the filling of the Three Gorges reservoir.The causes of the changes in earthquake frequency is also discussed in detail.It concludes that there is no noticeable difference in the depth of the epicenters before and after the reservoir filling,but the epicenters tend to be closer to the reservoir region after the filling,and the annual energy release of earthquakes is becoming stronger,which is primarily due to the increase in earthquake frequency in the reservoir area.
出处
《国际地震动态》
2012年第4期13-18,共6页
Recent Developments in World Seismology
关键词
三峡
水库
诱发地震
震源
地震频度
Three Gorges
reservoir
induced earthquake
epicenter
earthquake frequency
