Analyse @USGSVolcanoes's tweets
@USGSVolcanoes
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#40YearsAgo at #MountStHelens: 9:20 AM Seismograph goes wild. Reports of eruption. No response from Johnston. From plane, Don Swanson watches roiling, twisting helix. Clouds pull back enough to see column jets from great hole. Swanson radios—the top of the mountain’s gone! #MSH40 https://t.co/0N8c9RGvdi