Global Volcanism Program | Image GVP-06602
The broad Medicine Lake shield volcano, seen here on the horizon from Soldier Mountain to its south, is truncated by a 7 x 11 km caldera. Medicine Lake volcano has erupted lavas of widely varying composition ranging from basalt to rhyolite. The largest eruption of Medicine Lake during the past 11,000 years produced a massive basaltic lava flow from Giant Crater about 10,600 years ago. The flow traveled a distance of 45 km down the broad valley in the center of the photo from its vent on the SSW flank.
Photo by Lee Siebert, 1998 (Smithsonian Institution).