Cascades Volcano Observatory

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Color photograph of lava lake and rainbow
February 26, 2021

February 26, 2021 — Kīlauea

Heavy rains at the summit of Kīlauea Volcano (Hawaii) cleared on the afternoon of Friday, February 26, 2021, to show the steaming surface of the lava lake at Halema‘uma‘u viewed from the west. A rainbow arches over the lake looking east across the crater toward Kīlauea Iki. This photo was taken within an area of Hawai‘i Volcanoes National Park that remains closed to the

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Ash cloud simulation for an eruption size of 5/18/1980 Mount St Helens
December 16, 2020

Ash cloud simulation for an eruption size of 5/18/1980 Mount St Helens

If Mount St. Helens (Washington) were to have an eruption today the same size as that of May 18, 1980, this model simulation shows the ash cloud reach.

Ash cloud simulation for moderate sized eruption of Mount St. Helens
December 16, 2020

Ash cloud simulation for moderate sized eruption of Mount St. Helens

If Mount St. Helens were to have a moderate sized eruption today (similar to Mount Spurr, Alaska, August 18, 1992), this model shows the ash cloud extent. 

Ash cloud simulation for a small eruption of Mount St. Helens
December 16, 2020

Ash cloud simulation for a small eruption of Mount St. Helens

If Mount St. Helens were to have a small eruption today (similar in size to its July 22, 1980 eruption), this simulation shows the ash cloud extent.

Geophysicist checks data output at Mount Rainier station
October 9, 2020

Geophysicist checks data output at Mount Rainier station

A seismologist with the Cascades Volcano Observatory checks the data output on a newly installed monitoring station at Mount Rainier.

Station PARA at Mount Rainier
October 8, 2020

Mount Rainier's seismic and infrasound station PARA

Seismic and infrasound station PARA, installed October 6-8, 2020 at Mount Rainier.

Geophysicist takes notes after installing a seismometer at Mount Rainier
October 6, 2020

A geophysicist notes location of new seismometer at Mount Rainier

A geophysicist from the Cascades Volcano Observatory notes the location of a newly buried seismometer at station PARA, on Mount Rainier.

NAGT intern installs an infrasound array at Mount Rainier
October 6, 2020

NAGT intern installs infrasound sensors at Mount Rainier

NAGT intern Emily Bryant installs one of three infrasound sensors at volcano monitoring station PARA, at Mount Rainier.

Volcano monitoring station BRSP, on the north flank of Mount Hood
October 1, 2020

Volcano monitoring station BRSP, on the north flank of Mount Hood

View of the combined seismic/GPS station BRSP, on the north flank of Mount Hood, Oregon. Mount Hood is pictured in the distance.

Finishing the installation of seismic/GPS station YOCR, at Mount Hood
October 1, 2020

Finishing the installation of seismic/GPS station YOCR, at Mount Hood

A USGS Cascades Volcano Observatory field team finishes the installation of the combined seismic/GPS station, YOCR, at Mount Hood, Oregon.

Seismic/GPS station YOCR, at Mount Hood
October 1, 2020

Seismic/GPS station YOCR, at Mount Hood

A Cascades Volcano Observatory field team completes the installation of the combined seismic/GPS station YOCR, at Mount Hood. Effective monitoring requires a geographically distributed network of instruments that are located on the upper flanks, and around the volcano, and for these stations to be in place before significant unrest occurs to catch the earliest subtle

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GPS mast installed at station LSON, on Mount Hood
October 1, 2020

CVO geophysicist installs a GPS mast at station LSON, Mount Hood

USGS Cascades Volcano Observatory Geophysicist Rebecca Kramer works on the installation of the GPS mast at new station LSON, at Mount Hood. The GPS measures subtle ground deformation that can occur in response to magma entering or leaving the magma reservoir several miles below the summit.