Mount St. Helens 'recharging' after USGS records increase in earthquakes in 2024

Alert levels for Mount St. Helens remain unchanged

PORTLAND, Ore. (KOIN) — Seismic activity around Mount St. Helens has increased to nearly 350 earthquakes between February 1, 2024 and June 18, 2024, and officials say it may be a sign of “recharging” activity.

The increase in seismic activity was only small earthquakes, but an increase nonetheless.

“Over the past few months, small-scale earthquakes have been detected at Mount St. Helens,” the Cascades Volcano Observatory said. “Seismicity is similar to what was observed at this volcano from July to December 2023. No significant changes in other monitoring parameters have been observed and there is no change in alert levels at this time. Mount St. Helens remains at normal activity levels.

Increased USGS seismic activity around Mount St. Helens (Courtesy USGS)

According to Publication

“Small earthquakes that occur under Mount St. Helens at depths well below sea level are generally thought to be related to pressure in the magma transport system. One reason for this pressure is the arrival of more magma, a process called recharging.

The Cascades Volcano Observatory continued, explaining that “magma slowly rises through the lower crust and accumulates in a reservoir 2.5 to 6 miles (4‒10 kilometers) below sea level. Recharge events can occur when magma enters the upper reservoir and increases pressures that lead to earthquakes.

The USGS Cascades Volcano Observatory says they will continue to monitor this activity and will provide any updates or warnings if necessary.

May marks 44 years since the eruption of Mount St. Helens, which sent ash and debris across the Pacific Northwest. Fifty-seven people were killed in what is considered the deadliest volcanic eruption in the United States

Experts often point out that earthquakes are simply part of what Mount St. Helens does. As Dr. Scott Burns, professor emeritus of engineering geology at Portland State University, previously told Nexstar's KOIN, Mount St. Helens has gone through “periods of coming back to life and then being inactive, then coming back to life and being inactive” since the May 1980 eruption.

Burns also noted that magma comes into the Mount St. Helens crater to form the dome.

According to the US Geological Survey, Mount St. Helens is the second most dangerous volcano in the United States after Kilauea Volcano in Hawaii, which last erupted earlier this month.

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