珠江三角洲地区新构造运动

概述了珠江三角洲地区新构造运动的基本特征：晚第三纪以来的构造运动经历了由强逐渐减弱，晚更新世（约50－30Ka B.P)又重新增强的演变。重点估算了晚第四纪珠江三角洲断块垂直构造运动速率，定量分析了分割断块的断裂构造的活动性。认为斗门断块区和广州－番禺断块区这两个次级断块构造以及围限它们的广州－从化断裂，三水－罗浮断裂，西江断裂，白坭－沙湾断裂的活动性相对较强。从区域地震构造而言 ，珠江三角洲新构造运动远弱于日本－琉球－台湾岛弧，也弱于奥东潮汕和桂东南灵山等强震危险区。但由于其震源浅及松软土层较厚，加上本区经济发达，人口稠密，因此地震造成的破坏和损失仍不可低估，必须加强抗震减灾工作。

The neotectonic movement in Pearl River Delta Area

The features of neotectonic movement in the Pearl River Delta Area may be summarized as follows: since Late Tertiary the movement gradually became weak and since Epileistocene (50-30Ka B.p) again became strong. The rate of the vertical motion of Pearl River delta area during Late Quaternary has been estimated and the fault tectonic active characteristics of cut those fault blocks has been discussed rationally. The results have indicated that activity of the Dolmen fault block and the Guano Thou -Pan you fault block are relatively stronger and that activity of cut fault blocks fault zones (the Guangzhou-Conghua fault, the Sanshui-Luofushan fault, the Xijiang fault, the Baini-Shawan fault) are relatively stronger too. Based on comparison of regional seismotectonic background,neotectonic movement in Pearl River delta area is far lower than the Japan-Riukiu-Taiwan island arc and lower than some strong earthquake areas such as the Chaoshan region of eastern Guangdong, the Lingshan region of south eastern Guangxi, too. We must be paid great attention to works of anti-earthquakes and lighten earthquake damages, because the earthquake focal were shallow, soft soil layers were thicker and Pearl River Delta Area is located the area of economic centre of South China and densely populated area.