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Eagle Lake Volcano | John Seach
(Brockman Flat)
California, USA
40.63 N, 120.83 W
summit elevation 1652 m
Fissure vents
Eagle lake is located at the junction of the Sierra Nevada, Cascades, and Basin Range. There are fifteen cinder cones and lava flow vents under 100 m high. Eagle Lake volcano consists of polygenetic cones in a volcano-testonic depression.
The most recent eruptions occurred 170,000 years ago at Black mountain which is a faulted, mafic, andesite volcano.
Further Reading
Clynne, M.A., Calvert, A.T., Champion, D.E., Muffler, L.J.P., Sawlan, M.G. and Downs, D.T., 2017. Age of the youngest volcanism at Eagle Lake, northeastern California-40Ar/39Ar and paleomagnetic results. US Department of the Interior, US Geological Survey.
Eagle Lake Volcano Eruptions
Two main periods of activity.
4.6 to 2.1 million years ago.
0.17 to 0.05 million years ago.