Scientists have heightened their vigilance over three U.S. volcanoes—Alaska’s Great Sitkin and Mount Spurr, along with Hawaii’s Kilauea—as seismic activity increases and eruption threats grow. Great Sitkin now sits at ‘Watch’ status, the third level in a four-tier warning system, following small earthquakes and lava emissions from its summit crater. Mount Spurr, located 75 miles […]