Alaska volcanoes now pose lower threat, after quakes slow
Diminished earthquake activity has 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
Your support helps us to tell the story
From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, we know how important it is to parse out the facts from the messaging.
At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.
The Independent is trusted by Americans across the entire political spectrum. And unlike many other quality news outlets, we choose not to lock Americans out of our reporting and analysis with paywalls. We believe quality journalism should be available to everyone, paid for by those who can afford it.
Your support makes all the difference.Diminished earthquake activity led authorities Thursday 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 lowered the warning level to “Advisory” status from “Watch” for both Tanaga and Takawangha volcanoes on remote Tanaga Island, located about 1,250 miles (2,012 kilometers) 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 (8 kilometers). During the peak, the quakes had magnitudes up to 4.0.
No other signs of unrest have been detected, a statement from the observatory said.
Tanaga is the middle of three volcanoes on the island, with Takawangha located to the east. A third volcano on the island, Sajaka, is about 2 miles (3 kilometers) to the west of Tanaga, and was not showing any sign of activity.
Since the island has no residents or structures, there was little chance of damage from the thick, viscous lava flows in an eruption. However, an ash cloud could pose threats to aircraft, potentially disrupting air travel between North America and Asia, and health problems for communities farther away.
The nearest community, Adak, is about 65 miles (104 kilometers) to the east, on a separate island.
The last known eruption for Tanaga was in 1914. It erupted twice in the late 1700s and again in 1829.
The observatory has said there are no known eruptions of Takawangha or Sajaka. However, field work has indicated that eruptions may have occurred from those volcanoes and misattributed to Tanaga.