No latest activity reported for #volcano.name#.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Browne B, Bursik M, Deming J, Louros M, Martos A, Stine S, 2010. Eruption chronology and petrologic reconstruction of the ca. 8500 yr B.P. eruption of Red Cones, southern Inyo chain, California. {Geol Soc Amer Bull}, 122: 1401-1422

Bursik M, 2002-. Long Valley tephra database. http://www.volcano.buffalo.edu:9090/mmvz

Hildreth W, 2004. Volcanological perspectives on Long Valley, Mammoth Mountain, and Mono Craters: several contiguous but discrete systems. {J Volc Geotherm Res}, 136: 169-198

Hill D P, Prejean S, 2005. Magmatic unrest beneath Mammoth Mountain, California. {J Volc Geotherm Res}, 146: 257-283

Huber N K, Eckhardt W W, 1985. Devils Postpile story. {Sequoia Nat Hist Assoc}, 30 p

Huber N K, Rinehart C D, 1967. Cenozoic volcanic rocks of the Devils Postpile quadrangle, eastern Sierra Nevada California. {U S Geol Surv Prof Pap}, 554-D: 1-21

Miller C D, 1989. Potential hazards from future volcanic eruptions in California. {U S Geol Surv Bull}, 1847: 1-17

Sorey M L, Evans W C, Kennedy B M, Farrar C D, Hainsworth L J, Hausback B, 1998. Carbon dioxide and helium emissions from a reservoir of magmatic gas beneath Mammoth Mountain, California. {J Geophys Res}, 103: 15,303-15,323

Mammoth Mountain, a trachydacitic lava-dome complex, lies on the SW topographic rim of Long Valley caldera. The 3369-m-high volcano lies west of the structural rim of the caldera and is considered to represent a magmatic system distinct from Long Valley caldera and the Inyo Craters (Hildreth, 2004). The latest magmatic eruptions at Mammoth Mountain took place about 57,000 years ago. Mammoth Mountain is surrounded by at least 35 mafic vents that are part of the same magmatic system and include Red Cones, two closely spaced basaltic cinder cones located SW of Mammoth Mountain and SE of Devils Postpile National Monument. The cones, whose name derives from colorful mantling scoria deposits, are unglaciated and were radiocarbon dated at about 8900 years ago. Phreatic eruptions, distinct from those at South Inyo Craters, took place about 700 years ago from vents on the north side of Mammoth Mountain. Recent unrest, including seismicity, gas emission, and tree kill, is thought to be related to dike intrusion beneath Mammoth Mountain in 1989.