ANCHORAGE, Alaska—Diminished earthquake activity led authorities to reduce the warning levels at two volcanoes on an uninhabited island in Alaska’s Aleutian chain because of the decreased potential for eruptions.
The Alaska Volcano Observatory on Thursday lowered the warning level to “Advisory” status from “Watch” for both Tanaga and Takawangha volcanoes on remote Tanaga Island, located about 1,250 miles southwest of Anchorage.
A swarm of earthquakes between March 9 and 11 signaled the increased chance of eruptions. However, since then, the rate and magnitude of quakes have decreased.
Several quakes per minute continue to be recorded under Tanaga Island, and the largest recorded in the last day was a magnitude 3.1 between the two volcanoes, separated by about 5 miles. During the peak, the quakes had magnitudes up to 4.0….