Earthquakes are very dangerous, so you should make sure that you understand
them. They happen several times a day and can last up to 85 seconds. When
you feel one starting, sit down. If you are sitting, you will take less
damage. If the quake is a strong one, and its center is near you, you can
lose enough HP to die no matter how healthy you were to begin with. During
even a fairly mild quake, fighting may be stopped and formations may be
broken up. MOBS may take a considerable amount of damage.
The worst thing you can do in an earthquake is try to move. You will be
hurt. When things fall down, they tend to go splat.