March 05, 2006
This sign marks the boundary between two tectonic plates, and sits on the San Andreas Fault. The Earthquake Trail at Point Reyes National Seashore takes hikers on a journey through the San Andreas Fault Zone. Rather than an actual line, the fault comprises a fairly wide area where the North American Plate meets the Pacific Plate. The fault is actually a transform fault, a plate boundary where two plates are sliding against each other. The last time the fault slipped in this area was 100 years ago -- during the famous 1906 San Francisco earthquake. Scars from this powerful quake are still visible along the Earthquake Trial.