Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Mammoth Mountain
Mammoth Mountain, a Pleistocene trachydacitic lava-dome complex constructed on the SW topographic rim of the Long Valley caldera between about 200,000 and 50,000 years ago, forms the broad peak on the horizon. The Red Cones (center and lower left) are part of series of about three dozen mafic cones surrounding Mammoth Mountain. The oxidized reddish scoria of the cone, which was formed during the early Holocene, is mantled at its base by light-colored pumice erupted from the Inyo Craters about 650 years ago. Photo by Lee Siebert, 1998 (Smithsonian Institution)
Volcano Number:323150
Volcano Name:Mammoth Mountain
Country:United States
Volcano Type:Lava dome(s)
Last Eruption:1260
Elevation:3369m
Tectonic Setting:Rift zone / Continental crust (> 25 km)
Pop. within 5km:2220
Pop. within 10km:6242
Pop. within 30km:7745
Pop. within 100km:77851
Latitude:37.631
Longitude:-119.032



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
323150 Mammoth Mountain 20678 Confirmed Eruption 2 SSW of Mammoth Mtn (Red Cones) Radiocarbon (uncorrected) -6540
323150 Mammoth Mountain 20679 Confirmed Eruption North flank of Mammoth Mountain