Tuesday, November 22, 2011
Wandering Around Inside a Volcano: Exploring Pinnacles National Monument
The park was established in 1908 for the unique scenery, but in the 1970s an extraordinary discovery was made: half the volcano was missing, and the missing half was on the other side of the San Andreas fault...195 miles away in Southern California! Pinnacles turned out to be an important piercing point of the fault and is critical in understanding the nature of the San Andreas fault system. I discussed this in an earlier post that included a map showing the offset (click here to see it).