Unified Interior Regions

Region 9: Columbia-Pacific Northwest

Regions L2 Landing Page Tabs

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SWFL seismic station, on the crater rim of Mount St. Helens, was re...
August 7, 2013

SWFL seismic station, on the crater rim of Mount St. Helens, was re...

This summer, crews made significant modifications to a monitoring station on the southwest flank of Mount St. Helens, greatly improving its operability in winter. Volcano monitoring stations are designed to integrate many instruments into a single package to lower power requirements, reduce instrument footprint on sensitive landscapes, be portable for rapid deployment and

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Image shows a scientific instrument on the slopes of Mount St Helens
August 6, 2013

Precise Surveying of Mount St. Helens Crater with RTK-GPS Technology

A survey base station is established using a RTK-GPS receiver with mobile units to collect data points in and around the crater. Information will be used to monitor surface changes, deformation, erosion and aggradation inside the crater. This type of technology is precise to the centimeter. View is to the south of Mount St. Helens, toward Crater Glacier and the lava domes

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Erosional channels lead away from the northern face of Crater Glaci...
August 6, 2013

Erosional channels lead away from Crater Glacier, Mount St. Helens

Crater Glacier, located inside the crater of Mount St. Helens, continues to move at an average rate of about 11 cm per day (4.3 inches). During warm weather months, meltwater creates erosional channels on the crater floor. Pictured at the center bottom of the image are newly carved (over the last two years) seasonal channels 2-4 m (6-13 ft) deep that funnel water to the

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Steam vent near 1980-1986 dome, in the crater of Mount St. Helens....
August 6, 2013

Steam vent near 1980-1986 dome, in the crater of Mount St. Helens.

Steaming continues on the 1980-1986 dome. View to the south and the east arm of Crater Glacier.

Fumerole near Mount St. Helens' 1980-86 dome maintains hole in Crat...
August 6, 2013

Fumerole near Mount St. Helens' 1980-86 dome

A fumerole near the 1980-86 dome keeps an open hole in the east arm of Crater Glacier. The hole is approximately 12 m (40 ft) in diameter, easily wide enough to hold a school bus and deep enough so you could not see the bus' top. View to the south.

Monitoring channel erosion and aggradation, Mount St. Helens (North...
August 6, 2013

Monitoring channel erosion and aggradation, Mount St. Helens (North...

Fieldwork includes direct observations of changes to streams and stream beds to determine how changes will affect the downstream transportation of sediments. Here, the braided North Fork Toutle (left) joins Carbonate Springs Creek (right). View to the east.

Helicopter gives SWFL "swing set" a lift, Mount St. Helens....
August 6, 2013

Helicopter gives SWFL "swing set" a lift, Mount St. Helens.

Monitoring stations need to be portable. Weighing about 500 pounds, this "swing set" structure can be airlifted into place or moved, as volcano monitoring needs change. An additional 1,000 pounds of equipment will need to be added to make the station fully functional.

Touchdown at monitoring site in Mount St. Helens' crater....
August 6, 2013

Touchdown at monitoring site in Mount St. Helens' crater.

Crews access remote monitoring sites by helicopter. Pictured out the window of the helicopter is a GPS and camera station, dedicated to remotely monitoring changes inside the crater and under the crater floor.

Taking the pulse of Mount St. Helens Volcano, Washington....
August 6, 2013

Taking the pulse of Mount St. Helens Volcano, WA.

Monitoring and upgrading ground-based sensor networks at the most active volcano in the Cascades is an on-going process. Crews made significant modifications to a seismic monitoring station on the southwest flank of Mount St. Helens, greatly improving its operability in winter.

Precise surveying of Mount St. Helens crater with RTK-GPS technolog...
August 6, 2013

Precise surveying of Mount St. Helens crater with RTK-GPS technology.

A survey base station is established using a RTK-GPS receiver with mobile units to collect data points in and around the crater. Information will be used to monitor surface changes, deformation, erosion and aggradation inside the crater. This type of technology is precise to the centimeter. View to the south, toward Crater Glacier and the lava domes.

August 1, 2013

C1 West Transect – 2013

Permanent Site: C1 West Transect; Depth: Meters (Feet); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.14525225,-123.57361291; Site Description: Substrate is entirely sand. All seaweeds are absent. Woody debris is scattered along entire transect (0:21 0:34, 0:59 seconds). Invertebrates are scarce with the

July 31, 2013

F2 West Transect – 2013

Permanent Site: F2 West Transect; Depth: 12.3 Meters (40.3 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.15672004,-123.55036603; Site Description: Substrate is mainly gravel mixed with a little cobble and an occasional boulder. Only remaining seaweeds are the dead stalks of the perennial