Earthquake Fault: A Dramatic Geological Fissure Near Mammoth Mountain
Mammoth Mountain owes its existence to millions of years of intense volcanic activity, making the surrounding region a hotspot for geological wonders. One of the most accessible is Earthquake Fault—a striking half-mile-long fissure in the earth, likely formed during the last eruptions of Inyo and Mono Craters.
Geologically speaking, it's a fissure rather than a true fault: a clean shear in an ancient rhyolite lava flow. This dramatic feature serves as a vivid reminder of the immense forces at work beneath the surface. Ice and snow often persist at the bottom into late summer, and Native Americans as well as early settlers used it as a natural refrigerator for storing perishable foods.
Access Earthquake Fault via Minaret Road, about 1 mile west of the Mammoth Scenic Loop, or by heading west on State Route 203 for a mile past Mammoth Village, where you'll find a marked turnoff. The parking area offers restrooms and picnic tables, plus a 0.3-mile self-guided interpretive trail through stands of old-growth trees leading directly to the fault.
Winter access can be challenging but is possible via cross-country skiing for the adventurous. Beyond the interpretive trail, mountain bikers can tackle the 4-mile Mountain View Trail to reach stunning Minaret Vista.
