Cascades Volcano Observatory

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Mount St. Helens before the May 18, 1980 eruption. View from the no...

Mount St. Helens before May 18, 1980 eruption

Before the devastating May 18, 1980 eruption, Mount St. Helens was considered to be one of the most beautiful and most frequently-climbed peaks in the Cascade Range. Spirit Lake was a vacation area offering hiking, camping, boating, and fishing.

Mount St. Helens prior to the catastrophic eruption of May 18, 1980...

Mount St. Helens prior to catastrophic eruption of May 18, 1980. St...

Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.

Researchers generate a bathymetric contour map of Castle Lake, near...

A bathymetric contour map of Castle Lake, Mount St. Helens.

Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat. The frequencies of the send-receive pairs are used to calculate depth. More

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View of Mount St. Helens volcano, looking into the crater

Johnston Ridge Observatory Webcam, Mount St. Helens

This static image is from a USGS Cascades Volcano Observatory research camera located at the Johnston Ridge Observatory, north of Mount St. Helens.  The view is to the south.  This camera is intended to assist the USGS with situational awareness. At times, clouds, rain, and snow obscure visibility.  Because this camera is located in a harsh environment, it may sporadically

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Before the eruption of May 18, 1980, Mount St. Helens' elevation wa...

Before the eruption of May 18, 1980, Mount St. Helens' elevation wa...

Mount Adams elevation is 3,745 m (12, 286 ft). Mount St. Helens was the smallest of five major volcanic peaks in Washington State.

Testing bathymetric equipment at Coldwater Lake, Mount St. Helens...

Testing bathymetric equipment at Coldwater Lake, Mount St. Helens

Adam Mosbrucker tests equipment (Acoustic Doppler Current Profiler, survey-grade RTK-GPS and a map-grade GPS) in preparation for a lake bottom survey.

Map of the extent of Newberry lavas including approximate ages of s...

Extent of Newberry lavas including approximate ages of surficial flows

Extending approximately 75 miles north to south and 27 miles east to west, Newberry Volcano and its broad apron of lavas (light yellow shaded area) cover a total area of almost 1,200 square miles, making it the largest volcano of the Cascades volcanic chain. Its lavas stretch north beyond Smith Rock State Park, and south almost to Fort Rock State Natural Area. The town of

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Leveling measurements of the slope of the Mount St. Helens' crater ...

Leveling measurements of the slope of the Mount St. Helens' crater ...

Tiltmeters allowed 24-hour monitoring as the information was telemetered back to CVO. Other instruments such as displacement meters for measuring cracks, seismometers for measuring earthquakes, gas sensors for measuring gas concentrations, and magnetometers for measuring the magnetic field, were also used for 24-hour monitoring. Spirit Lake is visible in the background in

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