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本文对北西向的望谟—逻西—八南断裂带作了较详细的研究,其东南段在大坝西侧库内十余公里处通过,有6级地震的危险性,对大坝约有V11度的影响;库外紧邻大坝的天峨背斜东西两侧发育的断裂带,自上新世—早更新世以后无明显活动迹象;库域东南侧有一个断裂闭锁区,有发生中强地震的可能性,对大坝有一定的影响,库域北缘之弧形构造对大坝基本无影响。可能诱震的主要构造有:望谟一逻西一八南断裂带的东南段与西北段,库域区北缘的弧形构造。此外,库域区东南侧之更新库段,也可能因蓄水而诱震。
In this paper, a more detailed study is made on the northwestern Wangmo-Laxi-Sinan fault zone. The southeast segment passes through more than ten kilometers in the west bank of the dam with a magnitude of 6 earthquakes. There is a V11 degree of influence; outside the reservoir immediately adjacent to the dam Tianhe anticline developed on both sides of the fault zone, since the Pliocene - Early Pleistocene no significant signs of activity; the reservoir area on the southeast side of a fault closure area, there have occurred The possibility of moderately strong earthquakes has some impact on the dam. The arc structure at the northern margin of the reservoir area has basically no effect on the dam. The main tectonics that may be induced include: the arc-shaped structure in the southeast and northwestern sections of the Wangmu-Xiyan-Nannan fault zone and the northern margin of the Kudiu area. In addition, the updated reservoir section on the southeastern side of the reservoir area may also be induced by water storage.