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为查清滇西地震科学实验场内地震与地质构造特征,由云南省地震局综合队,国家地震局地质研究所组成的地震地质考察组,于今年上半年,对大理地区进行了野外考察。在大理南部下关附近的团山和洱海东岸银梭岛,发现了两个古地震遗迹现场。这个发现对于研究该区古地震和地震重复率提供了重要的线索。 在团山附近,洱海滨岸湖相地层中,一个长约200米的人工开挖剖面,展现了清楚的地层露头(照1)。
In order to find out the characteristics of the earthquakes and geological tectonics in the Earthquake Science Experimental Site in Western Yunnan Province, the seismological and geological investigation team composed of the comprehensive team of Seismological Bureau of Yunnan Province and the Institute of Geology of the State Seismological Bureau made an expedition to Dali in the first half of this year. Tuan Mountain near Shimonoseki in the southern part of Dali and Silver Shuttle Island on the east coast of Erhai Lake discovered two sites of ancient earthquakes. This finding provides important clues for studying the paleoseismic and seismic repetition rates in this area. Near Tuan Mountain, a 200-m artificially excavated section of Erhai Lake shore facies shows a clear outcrop (photo 1).