中文摘要：

Web信息流是突发事件监控预警中重要的信息来源，通过研究信息流的爆发特性可以及时的了解事件发展的状态。利用隐马尔可夫模型对新闻渠道和微博两种渠道的信息爆发性模式进行了分析，对28起突发事件进行了实验研究。对两种渠道的信息爆发模式上进行了比较，实验结果表明两种渠道在信息爆发模式上存在差异，这种差异不仅与突发事件类型有关，而且与突发事件的等级有关。进而对两种渠道信息传播的时效性进行了研究，结果表明微博信息演化过程快于新闻报道。结论对于突发事件监控预警具有实际的指导意义。

英文摘要：

Web information is the important information source for su~eillance in emergency events, people can learn the status of the emergency through studying the burst of information stream. This paper proposed a method to model the burst of the information and compared the burst models between news reports and microblog information on emergency events through analyzing the 28 emergency events. The experimental results show that the burst models between the two channels are different, and the difference not only depends on the type of event, but also depends on the level of the emergency. Furtherly this paper analyzed the speed of the information burst between the news report and the microblog,the experimental result shows the microblog information is faster than news report in the burst speed. The conclusions are meaningful for the surveillance in emergency.