In SimCity (the 2013 version of SimCity, aka SimCity 5) there are six disasters that you can unlock to unleash on your cities.
Be careful though, because there isn’t a “save and reload” on your normal cities, so you may want to save these disasters for Sandbox Mode.
To unlock the disasters, you just need to meet some requirements in your regular cities.
Here are the disasters you can unlock, and how to unlock them.
SimCity 5 Unlockable Disasters
Big Lizard – Burn 100 tons of garbage in an Incinerator at the Garbage Dump
Earthquake – Mine 100 tons of coal or raw ore in your city
Meteor Strike – Have 200 tourists arrive on flights at the Municipal Airport in a single day
Tornado – Have 24 Wind Turbines at Wind Power Plants
UFO Encounter – Ship any resource to a Space Center Great Work
Zombie Attack – Add a Diagnostic Lab to a Hospital, and have 15 Sims die in a day