I have a five gallon acrylic bowfront tank under my bed. It doesn't have a hood, so I would probably on fill two gallons or so since you have to be moving with it.
Next to my goldfish tank, I have a small plastic container. Inside I have TetraBetta, a small ziploc bag of gravel, guessing 2lbs or so, about four feet of airline tubing, dechlorinator, active carbon, a fake plant, a sponge filter, and also a battery powered air pump another user mentioned above.
Air pump: http://www.amazon.com/Hagen-11134-Ma...8343947&sr=1-1
Edit: Also have a 150W heater in the box.
Earthquakes usually aren't a concern in Pennsylvania. I'm 13, and I've only been in one in my life. Weird enough, last summer, a hurricane, earthquake, and tornado all occurred within two weeks... we did have power outages for a bit though.