【摘要】 红水河中游地区是以北西向和北东向断裂相交叉为基本构造格局。在新构造运动时期,这两组老构造分段复活,将该区分割成一个相对独立的活动块体。 遥感信息与岩相古地理及汞矿化带相结合的分析结果表明:发震的垭都—紫云深大断裂,在新构造运动时期并未进入断块。遥感信息与历史震中的时空分布和断块结合分析表明:中强震震中绝大多数分布在断块以外,并以右江断裂带以南的频率为最大,由于这里已远在百公里之外,今后若再发生中强震,经过长途衰减,波及坝址的影响有限。 断块内距坝址15—20公里的巴鱼地区,近期发生过4.6级地震。这是一个处在乐业环状构造长轴转折端前沿,也是逻西活动断裂等多组断裂交叉处,小型环状构造也很发育,构造应力容易在此集中,历史震中与小型环状构造同断裂的交叉点关系密切。影像显示该区是相对孤立的局部地段,小震频繁,应力分阶段释放,不具备孕育强震的条件。 龙滩和岩滩电站坝址周围8公里内无大型或活动断裂通过,亦无两组以上断裂交叉点出现,构造稳定性良好,但应注意水库诱发地震的研究。更多还原

【Abstract】 In middle reaches of Hong Shui River, the basic structural net is constituted by the junctions of NW and NE faults. In neotectonic movement period, the region around power station became a relatively independent active body due to segmental relive of the NW, NE faults and Feng San fault block.The results from analysis of R. S. information combining with lithofacies-paleo-geograpic map and distribution of Hg mineralization show, that the Ya Du to Zi Yun deep-large fault (NW) was not included into the Feng San fault block in the neotectnic movement.Ba Yu region is 15 to 20 km distance wide from long Tan power station in fault block inside. Luo Xi active fault runs throughout this region, and the lighter earthquake is 4.6 level in recent period. This is a special region in the fault block inside which was located at a turn forward position of structural major axis of Le Ye large ring structures, the structural stress possibility concentrated at this area.Earthquake centers had closed relationship with the junctions of small ring faults. But this area is a relatively separate one, the small earthquake appeares frequently, the structural stress can be easy released, so there is no possibility to make a strong earthquake. This area has a good structural stability. But it must be carefule pay more attention to the earthquakes from reservoir stress.更多还原