It’s been at least seven years since three volcanoes erupted at once in Alaska, Loewen told NBC News.
The three volcanoes — Pavlof, Great Sitkin and Semisopochnoi — are all under a code “orange” alert, which means that the volcano has the potential to erupt or eruptions are underway with minor ash emissions, according to the Alaska Volcano Observatory. Two others are under a code “yellow” alert, meaning that they are showing signs of unrest.
Pavlof volcano, which sits about 600 miles (966 kilometers) away from Anchorage, is showing low-level unrest and minor ash emissions, while the Great Sitkin volcano, which is closer to the center of the islands, has a continuous flow of lava from its summit crater, according to the Alaska Volcano Observatory and NBC News.
The third volcano, Semisopochnoi, is located on an uninhabited island in the western Aleutian islands, according to NBC News. That volcano has had several explosions, occasional strong seismic tremors or shaking and low-level ash emissions, according to the Alaska Volcano Observatory. All three volcanoes have been erupting for more than a week.
The volcanoes are part of the so-called Aleutian Arc, which is a chain of volcanoes that sits on the boundary between two tectonic plates, according to Science Alert. These plates are large pieces of Earth’s crust that move and bump into one another, spurring much of the planet’s volcanic eruptions and earthquakes.
Read the original NBC News report here.
Originally published on Live Science.