Geologically, Point Reyes is not a part of the continental USA as it sits on a different tectonic plate than most of the country. The San Andreas fault runs deep below this area and created Tomales Bay. During our first afternoon at Point Reyes National Seashore, we took a leisurely walk on the "Earthquake Trail" that is an interpretive walk through earthquake. According to Wikipedia, "this trail runs directly over the San Andreas Fault, deep underground. so that it is possible to stand straddling the fault line."
It was quite informative and for those who wonder how we can live in California, at least we don't have "earthquake season" like people in the Midwest and East Coast have hurricane and tornado seasons.