This animation by Dr. Tanya Atwater shows a possible history of southern San Andreas fault ruptures from a study by Sieh, Stuiver, and Brillinger, 1989. They deduced the rupture history from the interpretion of disruptions of sedimentary beds in cross-fault trenches and from data collected after historic earthquakes. They show ruptures during major earthquakes in 1100, 1346, 1480, 1680, 1812, and 1857 AD. Especially impressive are two huge events, in 1100 and 1480, that appear to have ruptured t