城镇是一定地域内的经济、政治、文化中心,具有聚集性、整体性、关联性、区域网络性、动态性等特点。城镇系统作为一个动态开放的复杂系统,其灾害除具有一般灾害的共同特征外,还具有自己的一些独特特征。主要表现为:(1)灾害损失的严重性。由于城镇人口密集,经济发达,各类设施高度集中,发生在城镇的灾害往往给城镇带来巨大损失。 Cities and towns are economic, political and cultural centers within a certain area. They are characterized by aggregation, integrity, relevance, regional networks and dynamics. As a dynamic and open complex system, the urban system has its own unique characteristics in addition to its common characteristics of common disasters. Mainly as follows: (1) the severity of disaster losses. Due to the densely populated urban areas, the developed economy and the high concentration of various kinds of facilities, the disasters that have taken place in cities and towns tend to cause huge losses to cities and towns.