You really can't tell when an earthquake will happen. So it's better to be prepared at all times. Regularly check your walls and ceilings and make sure that they are still stable. If not, do the necessary repairs. You also need a first aid kit in case you (or a family member) get hurt after an earthquake. It is also better to have a whistle so you can call for help in case you get in a really bad situation or get seriously injured.