There was an earthquake in Korea last night off the coast of Ulsan (slightly north of Busan)
(minor, no huge damage reported but there is a risk of mud slides!)
Here's the word for earthquake:
지진 - Ji-jin
Here are a few words to know if you're in an earthquake in Korea:
도와주세요! - Please help!
주의 - Caution
비상구 - Emergency Exit
기다려요 - Wait, stay
But really, if you're experiencing an earthquake, find something hard and stable to hide under. Running around trying to get out of a building can actually hurt you more as you might fall or be hit by falling objects. Try to wait out the shaking, then find a way out.