Yes, there are both higher and lower risk areas in CA. There are some areas with near zero risk. One could make a similar comment about the USA as a whole. An international student who was attending college in the USA might have higher risk at some colleges in the USA and lower risk at other colleges in the USA. Different colleges in the same state or country often have completely different risk of natural disasters, with different types of natural disasters having higher or lower risk.
My point is why focus on the state in which the college is located, rather than the actual risk level?