Images

Mount St. Helens, as viewed from the East-Northeast. The inside of the crater rim is just visible in the upper right of the mountain.

Aerial view of Spirit Lake (center) looking north from above the crater of Mount St. Helens. The lake's outlet to the west (left) was blocked by the 1980 landslide, which required a new engineered outlet to maintain the lake at a safe level. A tunnel was drilled through a bedrock ridge on west side of lake in 1984-1985. Glacier covered Mount Rainier in distance.

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.

Mount St. Helens, as viewed from the Castle Lake Overlook.

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

Mount St. Helens, Washington seen from the flank of Mount Adams to the east.

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.

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.

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

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.

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

eruptions.

High-resolution digital elevation dataset for Newberry Volcano and vicinity, Oregon, based on lidar survey of August-September, 2010 and bathymetric survey of June, 2001.

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

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).

Paulina Lake, in the caldera of Newberry Volcano. View looking south-southeast.

Map view plot of earthquakes located by the Pacific Northwest Seismic Network from March 14, 2016 through May 4, 2016. Only high-quality locations are shown (8 or more observations with a 130 degree gap or less between observing stations).

The top plot is the number of located earthquakes per week from the Pacific Northwest Seismic Network's catalog. The bottom plot shows the earthquake depths with time. Earthquakes are plotted as circles with the size of the circle corresponding to the magnitude of the earthquake (see legend).

During the first few days of Mount St. Helen's earthquake swarm in March 2016, the September Lobe monitoring station (located on the 1980-86 dome) was buried in deep snow and not transmitting data.

USGS scientists Kate Allstadt and Cynthia Gardner tell the story of the May 18, 1980 eruption of Mount St. Helens and how the catastrophic landslide, lateral blast, and lahar changed the landscape.

Newberry Volcano's youngest lava flows. Source: Robinson, J.E., Donnelly-Nolan, J.M., and Jensen, R.A., 2015, Newberry Volcano’s Youngest Lava Flows: U.S. Geological Survey Scientific Investigations Map 3329, 1 sheet, https://dx.doi.org/10.3133/sim3329.

Debris flow in channel near Butte Camp, Mount St. Helens, Washington.