Filters: Tags: CVO-A Cascades Volcano Observatory Collection (X)
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Index card: Edge of blast zone left an almost definite line between standing and downed trees. Standing trees were killed by the blast. Skamania and/or Cowlitz County, Washington. 1980.
Index card: This slide was taken at the point where Muddy River plunges down through the canyon and shows part of the stratigraphy of the mudflow. The water flowing in the left center of the slide is draining the surface of the mudflow and is cutting downward through the mudflow. Seven samples taken from this flow range in concentration greater than 500,000 milligrams per liter. Clear water showing the lower left-hand of the slide is issuing forth from a spring located immediately behind the helicopter. Geologists at work in view. Skamania County, Washington. 1980.
Index card: View looking downstream at the mouth of Pine Creek where it enters the Lewis River. One can see the deposition of mud on May 19, 1980, the abutments of the bridge, and the subsequent cutting of the new channel. Skamania County, Washington. 1980.
Index card: Oblique aerial view showing mudflow sequence occurring on the southeast flank of the volcano. In the center is the Muddy River drainage basin and in the right center of the view is the canyon through which the Muddy River plunged downward to subsequently flow into the Swift Reservoir. The mudflow deposit is approximately 2 miles across and shows the mudflow flowing across the drainage divide in the East Fork Pine Creek drainage basin. On the left is the Pine Creek drainage with the mudflow ending about mid-slide where a portion of the Muddy River mudflow again crossed the divide. Note how the mudflow followed topography and shows super-elevations on the outside of bends. Skamania County, Washington....
Index card: Effects of ash from the May 18 eruption of Mount St. Helens on agricultural areas in eastern Washington. Compacted ash 0.75 to 1 inch thick smothered lentil plants in this field about 25 miles south of Spokane. The severe damage to this crop is obvious, but many crops in the "ash belt" produced profitable returns in 1980 despite the ashfall. Near view of person lifting section of dirt showing ash layer on top of soil. Spokane County, Washington. July 1980. (Photo by Earl Baker, U.S. Soil Conservation Service; same as MSH-PP 1249 no. 53ct (msh_1249_00053_ct)). Published as Figure 49-A in U.S. Geological Survey. Professional Paper 1249. 1982.
Index card: A closer oblique aerial view of the east arm of Spirit Lake. Note the trees washed from the hillsides. Blast material displaced Spirit Lake water upward onto hills - the water then picked up the logs and flowed back into the lake on top of the blast materials. Skamania County, Washington. June 4, 1980. (Photo by Austin Post, USGS/Glaciology).
Index card: View of geologist holding one of those needle points at end of tree; note large fall in elevation as the mudflow moved downstream in background.Cowlitz County, Washington. 1980.
Index card: A closer view of the dome. It was later blasted out by the July 22, 1980 eruption. Skamania County, Washington. 1980.
Index card: Land area on avalanche material with some hummocks of blast material. Aera was flooded during mudflow. Mount St. Helens in background. Skamania County, Washington. 1980.
Index card: Oblique aerial view of elk on south flank of Mount St. Helens. Skamania County, Washington. 1980.
Index card: Nearer oblique aerial view of gully system in South Fork Toutle River mudflow, showing the erosion that occurred as a result of the mudflow, and the scour marks on the side of the gully. For scale, the eroded portion of the gully is approximately 300 feet across and 300 feet deep. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view of the eruption of May 18, 1980 which sent volcanic ash, steam, water, and debris to a height of 60,000 feet. The mountain lost 1300 feet of altitude and about 2/3-cubic mile of material. Note the material streaming downward from the center of the plume and the formation and movement of pyroclastic flows down the left flank of the volcano. Skamania County, Washington. May 18, 1980. (Photo by Austin Post, USGS/Glaciology).
Index card: View from approximately the same location as photo no. 37ct (cvoa0037_ct), shows the avalanche material to a depth of 100 feet on the right, and the parent material on the left. Helicopter in center of view for scale. Cowlitz County, Washington. August 11, 1980. (Photo by E.H. McGavock, USGS/WRD).
Index card: Oblique aerial view looking downstream at the South Fork Toutle River. Note the large deposits of mud for some 30 miles downstream, and the two different colors of mud, indicating that there were two mudflow events on this fork of the river. In the center of the view is an area where an indirect measurement of discharge was attempted. Large standing waves with wavelengths of 200 to 400 feet and amplitudes of 30 feet were found in this area. Note the deposits of mud and the over banks in the foreground of the view how the mudflow followed the topography throughout the course of the river. Cowlitz County, Washington. May 19, 1980.
Index card: Higher altitude view of denuded mountains. Skamania and/or Cowlitz County, Washington. June 19, 1980. (Photo by Austin Post, USGS/Glaciology).
Index card: Oblique aerial view of snow fields under ash on eastern flank of Mount St. Helens after May 18, 1980 eruption. Skamania County, Washington. 1980.
Index card: A nearer view of avalanche material in North Fork Toutle valley above Elk Rock. Cowlitz County, Washington. 1980.
Index card: Geologist on ice block in avalanche material in North Fork Toutle valley above Elk Rock. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view looking upstream at former location of bridge shown in photo no. 40ct (cvoa0040_ct). Notice the mud deposits on the overbanks, especially those on the left moving upstream on the road. Cowlitz County, Washington. 1980. (Same as MSH-PP 1249 no. 34ct (msh_1249_00034_ct)). Published as Figure 21-C in U.S. Geological Survey. Professional Paper 1249. 1982.
Index card: Eruption activity began on March 24, 1980 with a series of earthquakes. On March 27, 1980 steam and ash eruptions occurred. Two craters appeared on the peak which eventually came together forming one large crater. Running across the peak of the volcano in this oblique aerial view one can see the large crack that developed in the ice. In the right foreground is a massive bulge of material moving out as a result of pressure from within the volcano. Skamania County, Washington. March 30, 1980. (Photo by Austin Post, USGS/Glaciology).
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