中文摘要：

本文以突发自然灾害事件网络新闻数据为研究对象，采用生存分析法和内容分析法描述了地震灾害事件和台风灾害事件的网络媒体报道的生命周期，探索了影响生存过程的因素，并总结了两类灾害的媒体报道周期特征。分析发现灾难发生时的死伤人数、灾难级别和相关预警信息对灾害报道的生命周期有着明显的影响。地震的网络新闻报道具有“爆发”和“长尾”特征，台风的网络新闻报道则具有“前紧后松”的特点。该研究揭示了网络媒体对突发自然灾害事件的报道规律。

英文摘要：

Based on emergent natural disaster network news, we use the survival analysis method and content analysis to describe the news lifecycle of the Earthquake and the Typhoon disaster events that repor- ted by network media, exploring the factors that influence the survival process and summing up the periodic characteristics of two disaster news. We conclude that the following elements including the number of casual- ties suffered by the disaster, the disaster level and the early warning information related to disaster have sig- nificant influence on the news lifecycle reported by network media. In addition, network news coverage of the Earthquake shows ＂outbreak＂ and ＂long-tail＂ characteristics, the Typhoon has the characteristics of ＂tight first but loose afterwards＂. The study reveals the rule of emergent natural disaster event reported by network media.