Here is a sure prediction: the next big quake will not happen at a time that is convenient for you. You will be at work, or on your way home, or out shopping, or sleeping, or in the shower. In the best case, you will have ten minutes or twenty or thirty to decide what to do, in the worst case, you will have seconds. What you have on your feet, in your pockets, and in your reach can increase your chances of survival.