Secondary disaster prewarning based on GIS and subsequent risk analysis

This paper presents a method to analysis a disaster´s subsequent risk in a comprehensive manner by using both GIS and disaster theory. Secondary disaster should always be considered because it can often cause worse problems if people are left unconscious and unprepared. Here GIS was used as an essential tool to seek risk source of secondary disasters which can be induced by original disaster at certain circumstance. The system architecture of the disaster management system was introduced and the relationship between original disaster and secondary disaster was modeled. Sets of necessary conditions were defined and described with tables in database. GIS buffer analysis was used to find the match of the conditions in space and was performed within the impact area given by computational disaster models. Thus, disaster impact area demarcation and secondary disaster risk were considered in a correlative manner for better disaster management.