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Small magnitude earthquake swarm continues at Mount St. Helens.

Small magnitude earthquake swarm continues at Mount St. Helens.

The earthquakes are volcano-tectonic in nature, indicative of a slip on a small fault. Such events are commonly seen in active hydrothermal and...

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Small magnitude earthquakes detected at Mount St. Helens.

Small magnitude earthquakes detected at Mount St. Helens.

The largest earthquake was a Magnitude 0.7, an event that would not be felt even if you were standing on the surface above it.

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Seismic stations pick up earthquake swarm near Gilchrist, Oregon.

Seismic stations pick up earthquake swarm near Gilchrist, Oregon.

This area also experienced periods of elevated seismicity in June-August 2001 and July-August 2012.

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Heavy rain at Mount St. Helens washes sediment downstream to the Kalama River

Heavy rain at Mount St. Helens washes sediment downstream to the Kalama River

The eroded sediments are volcanic deposits on the south-southwest side of the volcano.

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Binational Exchange provides opportunity for Chile and US officials to work together on volcano hazard risk reduction.

Binational Exchange provides opportunity for Chile and US officials to work together on volcano hazard risk reduction.

Scientists, civil authorities, and emergency managers from Chile and the U.S. met in California to discuss the challenges of effective volcanic hazard...

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Small debris flows observed in the White River drainage on Mount Hood.

Small debris flows observed in the White River drainage on Mount Hood.

USGS-Cascades Volcano Observatory geologists working in the area on August 21 observed higher sediment-laden stream flows and broad areas adjacent to...

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New Scientist-in-Charge at USGS Cascades Volcano Observatory

New Scientist-in-Charge at USGS Cascades Volcano Observatory

The U.S. Geological Survey is pleased to announce the selection of Dr. Seth Moran to serve as the new Scientist-in-Charge of the USGS Cascades Volcano...
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CVO has a new Scientist-in-Charge, Dr. Seth Moran.

CVO has a new Scientist-in-Charge, Dr. Seth Moran.

Former SIC John Ewert will rotate to a position within the Volcano Disaster Assistance Program, focusing on novel approaches to eruption forecasting...

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Small debris flows observed in Tahoma Creek at Mount Rainier National Park.

Small debris flows observed in Tahoma Creek at Mount Rainier National Park.

Some sediment from the debris flow was visible 8 miles downstream at the Highway 706 crossing.

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Media Advisory: GeoGirls Dig Geology at Mount St. Helens

Media Advisory: GeoGirls Dig Geology at Mount St. Helens

Twenty middle school girls from Washington and Oregon are participating in “GeoGirls,” an outdoor program jointly organized by the U.S. Geological...
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Washington State Volcano Preparedness Month

Washington State Volcano Preparedness Month

May is Volcano Preparedness Month in Washington state, providing residents an opportunity to become more familiar with volcanic risk in their...

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Media Advisory: Open House at USGS Cascades Volcano

Media Advisory: Open House at USGS Cascades Volcano

May 18th marks the 35th anniversary of the eruption of Mount St. Helens and the onset of volcanic activity from 1980 to 1986.  In commemoration, the U...

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