I just came across a new Apps for America application that is based on data provided on data.gov mashed with Google Maps and Twitter messages from the region. Here is the information directly from their website:
DisastersMap is a website based on data sourced from data.gov.
The tool is meant to better inform Americans of weather disasters (earthquakes, storms), localizing on the map each of these disasters as well as showing comments on the subject made on Twitter.
DisasterMap illustrates as well the interest of the American Congress in weather disasters, offering data localized on the map thanks to Capitol Words. The map enables you to tweet in real time a disaster with your Twitter account. All data on earthquakes is sourced from the USGS (United States Geographical Survey) and the NWS (National Weather Service).