Wanderlust World Wanderlust World Stretching roughly 750 miles (1,200 kilometers) from Cape Mendocino in the north down to the Salton Sea in the south, the San Andreas Fault is the most famous geological feature in California. This massive right-lateral strike-slip fault marks the boundary where the Pacific Plate grinds horizontally against the North American Plate.
The fault's immense length and shallow depth make it a primary driver of the state's seismic activity. Its movement shapes the dramatic landscapes of the Coast Ranges and creates a constant, low-level hum of earthquakes that reminds residents they live on one of the planet's most dynamic tectonic boundaries.