The US Geological Survey reported that seismic activity on Mount Adams increased last month

By The Chronicle staff

September saw an increase in seismic activity at Mount Adams, according to the USGS Cascades Volcano Observatory and the Pacific Northwest Seismic Network.

A total of six earthquakes ranging in magnitude between 0.9 and 2.0 were recorded at a seismic station near the Cascade stratovolcano last month. Previously, the station recorded only one earthquake every two to three years, according to the US Geological Survey.

“This represents the largest number of earthquakes to occur on Mount Adams in a single month since monitoring began in 1982. No earthquakes were felt at the surface,” the USGS reported. “Locations and depths are not well constrained due to the scattered network of earthquakes on Mount Adams, and smaller earthquakes have occurred that seismologists have not been able to locate.”

The Mount Adams seismic network has only one seismic station about 7 miles southwest of the stratovolcano's summit.

With the sharp increase in seismic activity, the USGS Cascades Volcano Observatory and the Pacific Northwest Seismic Network are installing more temporary seismic stations to the south and southwest of Mount Adams.

These additional seismic stations will allow them to better detect and identify earthquakes in the area.

Despite this increase, the USGS volcano alert level for Mount Adams remains at its lowest level – green/normal – meaning the observed seismic activity is still considered background activity typical of an active volcano.

Aside from earthquakes, other green/normal alert level background activities include evaporation, thermal venting, and other thermal features, none of which have been reported at Mount Adams. Satellite images show no detectable ground distortion.

Offgassing is another green/normal alert level activity; However, Mount Adams currently lacks a dedicated volcanic gas sampling program, according to a USGS press release. It is not known whether the stratovolcano has recently vented gas.

Part of a cascading volcanic arc, which includes Mount Rainier and Mount St. Helens among 16 other volcanoes that extends from northern California to British Columbia, Mount Adams is located about 50 miles southwest of Yakima and 30 miles north of the White Salmon Hood River. Area along the Columbia River.

At 12,277 feet tall, it is the second tallest active volcano in Washington state after Mount Rainier, and the largest in the state by area and volume. According to the USGS, Mount Adams last erupted between 3,800 and 7,600 years ago.

Although the USGS is currently at the green/normal volcanic alert level, it still considers Mount Adams a high threat volcano according to its National Volcanic Threat Assessment – ​​the second highest level.

To learn more about Mount Adams and the recent seismic activity observed, read the press release from the USGS Cascades Volcano Observatory at https://bit.ly/47UpMNM.

As for earthquake activity in Mount Adams' neighbors, the Pacific Northwest Seismic Network's seismic tracker reports that Mount St. Helens has had 77 earthquakes in the past 30 days while Mount Rainier has had 16 earthquakes in the past 30 days.

Despite more frequent seismic activity, Mount Rainier is also at the USGS Green/Normal Volcano Alert Level. But it is still considered the most likely volcano to erupt next in the Cascade Volcanic Arc and the most dangerous volcano in the country.

Mount Rainier was named to the Decade Volcanoes list, which includes what are considered the world's 16 most dangerous active volcanoes — due to their high risk of eruption and proximity to densely populated areas — as determined by the International Association of Volcanology and Chemistry. From the ground.

While Mount St. Helens saw the most seismic activity in September, it is also the most recent eruption in the cascading volcanic arc, with its last major eruption occurring on May 18, 1980.

Mount Rainier and Mount St. Helens are both considered critically threatened volcanoes according to the USGS National Volcanic Threat Assessment – the highest level.

To view the Pacific Northwest Seismic Network's seismic activity tracker, visit https://www.pnsn.org/volcanoes.

For more information about the USGS Cascades Volcano Observatory, visit https://www.usgs.gov/observatories/cvo.

For more information about USGS Volcano Alert Levels, visit https://www.usgs.gov/programs/VHP/alert-level-icons.

To read the latest National Volcanic Threat Assessment conducted by the USGS in 2018, visit https://pubs.usgs.gov/publication/sir20185140.

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