I live in Lakeport,CA,on Clear Lake,the largest natural lake entirely confined within the California borders. We do have a volcanic mountain but I doubt that anything will ever happen there-certainly not in our lifetime. We do get pretty warm here in the summer, but not like Fresno as we have the coastal influence and always have a breeze on the hottest days. Rents here are among the lowest in California and the air was once again determined to be the cleanest in the United States!