Yep Kep,
One of my favorite UG courses at Stanford was Historical Geology. Then, each time I drove home to LA for spring break or Christmas I would take detours to see the exact geological features we had been hearing about in class--pretty neat!
What always fascinated me about Bodega Head is how the Head looks like it has been sliced off the mainland with a giant knife along its inboard side--and in fact that is pretty much what has happened along the San Andreas. Then as the Head moved out to sea, firmly attached to the Pacific Plate, the longshore currents filled in the gap between the Head and the mainland with deposited sand to form a classic marine geological feature known as a tombolo. You can clearly see that in the first pic above and in the one below where we are looking north along the coast. Based on current Pacific plate movement, it is expected that LA will be opposite San Francisco in abut 50 million years or so! Eventual cross-town rivals in at least baseball, dontcha know!
Of course, we now have the rather infamous feature on Bodega Head known as the "hole in the Head," where P.G.&E. began digging the reactor pit for their proposed nuclear power plant. It is now well-fenced-off and used to be rented to Sonoma County for $1.00/year, just in case PG&E ever got the go-ahead to build again. Fortunately, one of PG&E's own geologists could not agree that the rather jumbled rock along the Fault was stable enough on which to build a nuclear reactor right on the San Andreas itself, and the whole project was finally shelved!
As I recall, PG&E had planned for a maximum vertical movement of something like 7-12 feet. However, during the great Good Friday quake off Alaska in 1964 we had vertical movements along the coast of over 20 feet in places! And the prevailing winds at Bodega are such that the radioactive cloud from any kind of rupture would be over S.F. in about an hour or so! You can imagine the fun and games in trying to evacuate S.F. across the bridges and down the Peninsula. It's already a madhouse during rush hour!!