General Geological Situation of Yunnan Observatory Base for Solar Observation at Laoyingdi on the Shore of Lake Fuxian

The area, where the Yunnan Observatory Base for the Solar Observation will be situated in the Xiaojiang Faulted Zone, is no misplaced outcrop. The strata of P₂β-C around the base place constitute a syncline with the core of P₂β basalt and limbs of P₁ and C carbonatite, and there is no hiatus. The area is relatively stable with the small mass even if in the faulted zone. Because the strata are composed of dissoluble rocks the geologic hazards caused by dissolution should be paid attention to. The base place lies at faulted zone so that building resistanted to 8th earthquake magnitude is necessary.