The Guardian Natural Hazards pages - a good starting point for recent hazards.
The UN International Strategy for Disaster Reduction. Lots of very powerful and detailed information.
USGS Earthquake Information Centre - as up to date as you can get.
A good hub for information about recent earthquakes, volcanoes and tsunamis as well as other hazards.
The Sky Hot Topic website on Earthquakes - lots of up to date stories and news.
Once you've identified a hazard, this is a good place to start searching for more details and links. It is unwise to rely on Wikipedia as a source of information.