A Preliminary Study on Geological Structure and Seismological Activity in Fuxian Lake and Neighbouring Region

The area around the Fuxian Lake is in the west branch of the Xiaojiang fauted zone, and is one of the regions with potential seismic activities. The destructive earthquakes with magnitude larger than 5(with intensity grade Ⅵ) were happened in the region in history, and the region was affected many times by the earthquakes with magnitude larger than 6 occurred in the neighbouring regions. From the analyses of geological structure of seismology and the characteristics of the seismic activities in recent years, the Fuxian Lake and the regions nearby are possible potential locations of epicenter for magnitude 7 to 7.5 earthquakes in the future. Therefore, according to the rules and regulations stipulated in "Anti Seismic and Natural Disaster Reduction Act", "Ordinance of Anti Seismic and Natural Disaster Reduction of Yunnan Province" and "Implement Measures of Anti seismic and Natural Disaster Reduction of Yuxi City", it is suggested that Yunnan Observatory should carry out evaluation of the seismic security in its construction of the Fuxian Lake Solar Observatory in accordance with the national technical standards described in"Technical Specifications for Evaluation of Seismic Security at Engineering Sites".