The David A. Johnston Cascades Volcano Observatory is a volcano observatory that monitors volcanoes in the northern Cascade Range. It was established in the summer of 1980, after the eruption of Mount St. Helens.
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The David A. Johnston Cascades Volcano Observatory is a volcano observatory that monitors volcanoes in the northern Cascade Range. It was established in the summer of 1980, after the eruption of Mount St. Helens.
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