An earthquake swarm shakes the Fox Islands. Scientists say the reason is unknown

In early May, over the course of two days, more than 50 earthquakes occurred in the Fox Islands region of the Aleutian Islands. Most of the earthquakes were small, with a few larger events measuring >5 magnitude southwest of Umnak Island.

Similar swarms of earthquakes have occurred periodically in roughly the same location over the past 50 years, but scientists are still discovering their causes.

“This swarm, and similar ones in previous decades, suggest that there is something interesting or different about the physics of the fault at that particular location,” said Steven Holtkamp, ​​a data analyst at the Alaska Earthquake Center.

The Alaska Earthquake Center shared a story in May exposing the swarm. Scientists are theorizing about what could be causing the swarms in this area, but Holtkamp said he doesn't want to jump to conclusions now.

The Aleutian Islands are prone to earthquakes. Two of Earth's tectonic plates collide in the area, creating Alaska's massive thrust fault, known as the Aleutian Trench.

When plates slide, earthquakes usually have a mainshock followed by aftershocks. But swarms consist of a group of earthquakes without any distinct mainshocks. There may be several reasons why main trauma occurs, according to Holtkamp.

He said it may be particularly difficult to discover the cause of the swarms in the Aleutian Islands since the rift extends more than a thousand miles. For example, one cause of swarms could be magma moving inside a volcano, which could indicate that it is active.

“Every time there's a swarm, it's a little bit of a mystery to solve, you know,” he said. “Is it near a volcano? Is it related to slow sliding? Is it another process we need to think about? But something is causing them.”

Holtkamp said the strength of earthquakes can vary greatly in a region depending on how tightly the plates are sealed. Understanding the cause of these swarms could help improve knowledge of seismic hazards in the region, he said.

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