A magnitude 4.6 earthquake just struck near Alaska's Mount Spurr—a volcano currently showing signs of unrest. The tremor, felt as far as Anchorage, has reignited fears that the volcano could erupt at any moment. With rising magma pressure, underground gas buildup, and a history of explosive eruptions, experts warn that this could be the calm before the storm. If Mount Spurr erupts, ash clouds could reach 50,000 feet, disrupt air travel, and blanket nearby cities. Here's everything you need to know.
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