1986年1月28日07時(shi)13分,在廣(guang)東(dong)省陽江(jiang)縣西南20公(gong)(gong)里(li)(li)的洋邊(bian)海(北緯21.7度(du)(du),東(dong)經(jing)111.8度(du)(du))發(fa)生5.0級地震,震中烈度(du)(du)達(da)Ⅵ度(du)(du)。Ⅵ度(du)(du)線呈(cheng)近(jin)東(dong)西向橢圓形,長軸19公(gong)(gong)里(li)(li),短軸11公(gong)(gong)里(li)(li),其面(mian)積為209平方公(gong)(gong)里(li)(li)(圖1)。兩(liang)間危房倒塌,40余間產生輕微裂縫,未發(fa)現(xian)人畜(chu)傷亡。有感范圍較大,東(dong)至(zhi)香港,北達(da)廣(guang)州(zhou)、云浮(fu),西止于(yu)梧州(zhou),西南抵吳川(chuan)、湛江(jiang)。