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1955年4月14日,在北纬30°2′;东经101°51′处,发生了1次7.5级地震。此次地震震中烈度为Ⅹ度,震源深度,据古登堡—李希特公式计算约20公里,宏、微观震中相差不大.一、地震宏观破坏及烈度分布震区处于人烟稀少,藏、汉杂居地方,建筑物具有显著的地方性和民族特色,其它外围地区为穿斗楼房或平房,城关主要为砖木结构的房屋,为了便于统一衡量各地点的地震烈度,结合震区自然破坏情况,参照《新的中国地震烈度表》,将本区各烈度区分述如下
On April 14, 1955, a 7.5-magnitude earthquake occurred at latitude 30 ° 2’N and longitude 101 ° 51’E. The epicenter intensity of this earthquake is Ⅹ degree, and the focal depth is about 20 km according to the Gutenberg-Richter formula, and there is not much difference between macro and micro epicenters. 1. Macroscopic damage and intensity distribution of the earthquake The quake zone is sparsely populated. In the mixed area, buildings have significant local and ethnic characteristics. The other outer areas are piercing buildings or bungalows, and Chengguan mainly houses brick and wood structures. In order to facilitate the uniform measurement of the seismic intensity at all locations and in combination with the natural damage of the earthquake areas, With reference to “New China Earthquake Intensity Table”, the intensity of each area in this area will be divided as follows