Multimedia

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Map showing caldera features and caldera-related hazards at Medicin...

Map showing caldera features and caldera-related hazards at Medicin...

Green line (gas hazard zone limit) indicates elevation contour that defines the closed basin within the caldera, including Medicine Lake. In the event of significant volcanic gas emissions, the gases, which are heavier than air, could accumulate and potentially result in asphyxiation for anyone within the zone. It is likely that warning signs would be posted in such an

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Map showing Medicine Lake volcano lava flows 100,000 years old and ...

Map showing Medicine Lake volcano lava flows 100,000 years old and ...

Postglacial lavas ~13,000 years old and younger are shown in darker pink. Major lava flows are labeled, including anr (andesite of north rim) and asr (andesite of south rim). Five very large basalt lava flows are also labeled: bgc = basalt of Giant Crater, bmc = basalt of Mammoth Crater, byb = basalt of Yellowjacket Butte, bl = Lake Basalt, and bt = basalt of Tionesta.

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