Calm down, Carfax, your experience is frightening, but I don't think your true dream appeared because this eruption will affect you. Maybe you dreamt it simply because it's a big event and will affect other human beings and nature.
Of course, there is a possibility that volcanic activity in South America will trigger some geological activity in California, but if that consoles you Chile's volcanoes are quite active all the time and I don't have to tell you California is prone to shake every once in a while.
Dreams are great tool for finding out more about yourself, others, present, past and even future. So if you are worried, ask yourself before bedtime for another dream that will give you more information, or deeper insight in this matter.