Interesting choice of date. 100 years ago SF was rebuilding from the giant earthquake that had leveled most of the city three years before.
So, yeah, Detroit's got certain topographical advantages. People just can't remember that, because essentially none of the current residents of the Bay Area were living there in 1906, and human memory is short. But there may come a day when you remember. It'll be one day after one third of the buildings fall down and the water taps stop working.
And now for the public service announcement: If you live in the Bay Area, stockpile some drinking water and bolt your shelves to the wall!