广西大化水库附近的近期地震活动

RECENT SEISMIC ACTIVITY NEAR THE DAHUA RESERVIOR

研究了大化水库附近近期的地震活动特征及其与构造的关系。近期的地震活动与前期水库附近发生的地震有显著不同。几次较大地震震源机制解表明：震源应力场随时间变化明显，且与现代区域应力场不甚一致，震源错动方式也较特殊。分析认为，近期发生的地震应属构造型水库地震。

In this paper, the recent seismic activity near Dahua reservior was studied by discussing the difference between recent strength, frequency and past, the relationship between earthquake and time, space and tectonic condition. The focal mechanism of some earthquakes occured near Dahua reservior were also discussed in this paper. We believe that the recent seismic activity is difference from the past. The kind of recent earthquakes is tectonic. The focal stress field is special. But it is possible that the water affects the recent seismic activity completely.