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VANCOUVER, Washington (CNN) -- A small volcanic tremor shook Mount St. Helens early Sunday, less than a day after the volcano spewed a cloud of steam and scientists warned that a dangerous eruption was imminent.

The tremor Sunday was milder than the previous day's gas eruption, which prompted geologists to raise the volcano alert to Level 3, indicating an eruption could occur within 24 hours.

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Read entire volcanic gassiness problem here.