Natural disasters pose significant challenges to governments, as common communication lines often experience overload or disruption, hampering emergency response efforts. However, massive amounts of web data are available and easily accessible, waiting to be used. The evolution of information sharing have become critical elements of emergency awareness and effective response. People often use social networks to alert the public of crises and events in emergency situations, reporting location(s) and other relevant data. Proper use of this web data from vigilant monitoring and identification of location-based crises in various regions can benefit the resolution of natural disaster emergencies.