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Glass Mountain

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Maps showing areas of MLV covered by lavas of during the first eruptive interval, 500 to 300 ka.

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.
By
California Volcano Observatory, Medicine Lake
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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.
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Aerial view west across the upper part of Medicine Lake Volcano tow...

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.
By
California Volcano Observatory, Medicine Lake
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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.
Learn More