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Global Volcanism Program | Image GVP-03220

Hotlum cone, which marks the 4317-m-high summit of Mount Shasta, was formed during the early Holocene, and has been active frequently since.  A small depression in the summit dome that contains an active hot spring and groups of fumaroles may have resulted from the last eruption of Shasta in 1786. Photo by Lee Siebert, 1981 (Smithsonian Institution).

Hotlum cone, which marks the 4317-m-high summit of Mount Shasta, was formed during the early Holocene, and has been active frequently since. A small depression in the summit dome that contains an active hot spring and groups of fumaroles may have resulted from the last eruption of Shasta in 1786.

Photo by Lee Siebert, 1981 (Smithsonian Institution).


Shasta