Join the firefighter career by using the "Full profession level" cheat to boost yourself to level 10. You will receive a new fire truck and a fire department alarm to place in your home via the family inventory. Once it i shooked up to a wall, hover the pointer over the fire alarm. Hold [Shift] and click to get a new option to chose a type of disaster. Select "Earthquake". A giant earthquake will strike the entire town, causing numerous gas leaks, pieces of buildings to collapse, and Sims getting buried and trapped near flaming wreckage all over the town (including your own home). As you finish the first home you will realize how big of an aftermath it is, as you run off to the rescue.