一、概况汕头市规划区由市区、达濠镇和经济特区的龙湖片、广澳片组成,面积85km~2。地震危险性分析和地震影响小区划于1986年至1989年期间分三次完成。三次工围内的地面加速度(g)划分档次列于表2,其中广澳片区划为四档,其余划为三档。当遭遇50年超越概率10％的地震影响时,场地加速度值大体在0.17～0.23g之间,平均值约为0.19g。 I. General situation The planning area of ​​Shantou City is composed of the Longhu and Guangao films of the urban area, Daban Town and the special economic zone, with an area of ​​85km~2. Seismic hazard analysis and seismic impact plots were completed in three parts between 1986 and 1989. The grades of ground acceleration (g) within the three work envelopes are listed in Table 2. The Guangao section is divided into the fourth grade and the rest is classified as the third grade. When experiencing an earthquake with a 10% probability of surpassing 50 years, the site acceleration value is generally between 0.17 and 0.23g, with an average value of approximately 0.19g.