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 Mono-Inyo Chain
Photo of Obsidian flow and Wilson Butte, part of Inyo Craters.

Summary
Quick Facts

The Mono-Inyo Craters are a 29-km (18 mi) long chain of silicic lava domes, lava flows, and explosion craters found along the eastern side of the Sierra Nevada range between Mono Lake and Long Valley Caldera. Mono Craters comprise the northern portion of the chain and form an arcuate, 17-km (10.5 km) long group of 30 or more dike-fed eruption centers. Explosive eruptions at Mono Craters began more than 50,000 years ago from now-buried vents, but almost all of the exposed domes and flows are of Holocene age. The Inyo Craters are a 12-km (7.5 mi) long chain of volcanic features similar to the northern-lying Mono Craters. The latest eruptions at Mono-Inyo Craters took place about 600 years ago when explosive eruptions and lava flows produced tephra deposits and obsidian lava domes. Eruptions on Paoha Island, the northern tip of the chain also known as Mono Lake Volcanic Field, occurred approximately 300 years ago.
Location: California, Mono County
Latitude: 37.82° N
Longitude: 119.02° W
Elevation: 2,629 (m) 8,625 (f)
Volcano type: lava domes
Composition: rhyolite
Most recent eruption: 300 years ago
Nearby towns: Crestview, Mammoth Lakes
Alert Level: Normal
Threat Potential: High *