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Global Volcanism Program | Image GVP-06596

This pit crater on the SE rim of Medicine Lake caldera was formed during the first Holocene eruption of the volcano, about 4350 years ago.  The eruption, which followed a quiescent period of about 6000 years, produced andesitic scoria from a NE-trending alignment of pit craters.  Agglutinated spatter formed small lava flows.   Photo by Lee Siebert, 1998 (Smithsonian Institution).

This pit crater on the SE rim of Medicine Lake caldera was formed during the first Holocene eruption of the volcano, about 4350 years ago. The eruption, which followed a quiescent period of about 6000 years, produced andesitic scoria from a NE-trending alignment of pit craters. Agglutinated spatter formed small lava flows.

Photo by Lee Siebert, 1998 (Smithsonian Institution).


Medicine Lake