What are the different types of earthquakes? What causes them? Can scientists predict when they will occur? Questions like these can cause undue frustration. Catastrophic events can strike at any time, and you need to be prepared to safely respond when they do. Being prepared means learning how disasters work and what to expect. Below you will find everything from definitions of earthquake magnitude and differences between weather service warnings, to measuring air quality index readings and fire danger levels. 24/7NCEP wants to keep you informed.