Glass Mountain
Glass Mountain
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Eruption History of Medicine Lake Volcano
The eruptive activity at Medicine Lake volcano is probably driven by intrusions of basaltic magma that occur during east-west stretching of the crust in an extensional tectonic environment.
Glass Mountain obsidian flow, Medicine Lake volcano
Glass Mountain is a spectacular, nearly treeless, steep-sided rhyolite and dacite obsidian flow that erupted just outside the eastern caldera rim and flowed down the steep eastern flank of Medicine Lake volcano.