Cascades Volcano Observatory

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Temporary seismometers deployed at Mount St. Helens....
August 20, 2017

Temporary seismometers deployed at Mount St. Helens.

Between August 19-22, 2017, 140 seismometers were deployed around Mount St. Helens. Instruments were placed on top of the 2004-2008 lava dome, the 1980-86 lava dome, the 1980 crater floor, and around the volcanic cone. The goal of the month-long deployment was to capture small magnitude volcanic earthquakes and learn more about the shallow plumbing system beneath the

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Group of girls look at river
August 2, 2017

GeoGirls_Sediment1

GeoGirls collect water samples and flow measurements to model the transport of volcanic sediments.

A geologist remembers the Mount St. Helens eruption 37 years ago...
May 11, 2017

A geologist remembers the Mount St. Helens eruption 37 years ago

Aerial view of the May 18, 1980, eruption of Mount St. Helens as seen from the southwest. Columns of ash and volcanic gas reached heights of more than 24 km (80,000 ft) during the eruption.

A geologist remembers the Mount St. Helens eruption 37 years ago...
May 11, 2017

A geologist remembers the Mount St. Helens eruption 37 years ago

USGS geologist Don Swanson (in red) and his colleague, Jim Moore, view a car filled with ash deposits from the May 18, 1980, eruption of Mount St. Helens. Additional photos of the 1980 eruption of Mount St. Helens are posted on the USGS Cascades Volcano Observatory website: https://volcanoes

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Mount St. Helens monitoring station SEP during temporary installati...
April 21, 2017

Mount St. Helens monitoring station SEP during temporary installati...

Mount St. Helens monitoring station SEP during temporary installation of a 20 foot mast to restore data flow after heavy snow buried the site and cut off seismic data transmission.

The fiberglass hut that housed the electronics was crushed under the snow load and will need to be rebuilt summer 2017. The solar panel can be seen sticking out of the hut and is level

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Mount St. Helens monitoring station SEP buried in about 10-15 ft of...
April 21, 2017

Mount St. Helens monitoring station SEP buried in about 10-15 ft of...

Mount St. Helens monitoring station SEP buried in about 10-15 ft of snow. Station stands approximately 8 ft tall and is located to the right of the person in this photo. April 21, 2018

Girls points to a location on a map laying on the ground.
December 31, 2016

GeoGirls learn about the eruption of Mount St. Helens

GeoGirls learn about how the May 18, 1980 eruption of Mount St. Helens impacted the ecology of the area.

Group of students and scientists stand in semi circle with mountain in the background.
December 31, 2016

GeoGirls hike onto the Pumice Plain and learn about Mount St. Helens

GeoGirls hike onto the Pumice Plain to learn more about Mount St. Helens’ historical

eruptions.

Interpreted model of seismic wave speeds at Mount St. Helens with p...
November 29, 2016

Interpreted model of seismic wave speeds at Mount St. Helens with p...

Graphic shows an east to west cut-away of Mount St. Helens with an interpreted model of seismic wave speeds under the volcano and earthquakes from 2008-2016. The colors of the model represent changes in seismic p-wave velocities from tomographic studies (Waite and Moran, 2009; doi:10.1016/j.jvolgeores.2009.02.009). Cooler colors represent faster regions; redder colors are

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