一、概述 1986年1月28日07时13分,在广东省阳江县西南20公里的洋边海(北纬21.7度,东经111.8度)发生5.0级地震,震中烈度达Ⅵ度。Ⅵ度线呈近东西向椭圆形,长轴19公里,短轴11公里,其面积为209平方公里(图1)。两间危房倒塌,40余间产生轻微裂缝,未发现人畜伤亡。有感范围较大,东至香港,北达广州、云浮,西止于梧州,西南抵吴川、湛江。 I. Introduction At 0713 on January 28, 1986, a magnitude 5.0 earthquake occurred in the Yangbian Sea (21.7 degrees north latitude and 111.8 degrees east longitude) 20 kilometers southwest of Yangjiang County, Guangdong Province. The intensity of the epicenter reached Ⅵ degree. VI degree line was nearly east-west oval, 19 km long axis, 11 km short axis, with an area of ​​209 square kilometers (Figure 1). Two dilapidated buildings collapsed, more than 40 have minor cracks, no human or animal injuries found. Feeling a larger range, east to Hong Kong, north of Guangzhou, Yunfu, west of Wuzhou, Wuchuan arrived in the southwest, Zhanjiang.