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Typed caption accompanying slides: View of eruption between 18:30 and 18:31. Skamania County, Washington. (Photo by J. Vallance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken and Rick Hoblitt, who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They began at 17:14, 18:30 and 19:02 PDT. Additional note: Slides no. 28 through no. 37 show second eruptive pulse. This sequence was taken while moving counter clockwise from...
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Typed caption accompanying slides: Approximately 3 seconds after slide no. 11. Good illustration of "ash fountain" feeding material into the advancing pyroclastic flow. Skamania County, Washington. (Tip of wing of aircraft visible) (Photo by J. Valance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken and Rick Hoblitt, who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They began at 17:14, 18:30 and 19:02 PDT. Additional...
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Typed caption accompanying slides: View of eruption between 18:30 and 18:31. Skamania County, Washington. (Photo by J. Vallance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken and Rick Hoblitt, who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They began at 17:14, 18:30 and 19:02 PDT. Additional note: Slides no. 28 through no. 37 show second eruptive pulse. This sequence was taken while moving counter clockwise from...
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Typed caption accompanying slides: View of eruption at 18:26:30 on July 22, 1980. Mount St. Helens. Skamania County, Washington. (Photo by J. Vallance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken and Rick Hoblitt, who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They began at 17:14, 18:30 and 19:02 PDT. Additional note: Slides no. 5-25 were taken between 18:25:20 and 18:26:30. This sequence was taken while moving...
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Typed caption not available. Note: Slide numbers 43 - 50 were taken at 19:01 and show the pyroclastic flow as it advances northward. Skamania County, Washington. July 22, 1980. Slide number 51 was taken at 19:02. Slide numbers 52 - 55 were taken at 19:03. Slide numbers 56 - 57 were taken at 19:04. Slide numbers 58 and 59 were taken at 19:04 and 19:05. Slide numbers 60 - 62 are views of the eruption and were taken at 19:06. Slide no. 52, msh_vjw00052_ct, is highlighted in this photo record. Slide no. 52 typed caption: View of eruption at 19:03, the plume develops a mushroom-like head while the elutriate cloud from the pyroclastic flow billows up through the cloud layer. Skamania County, Washington. (Photo...
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Album caption: Oblique aerial view of Mount St. Helens as viewed from the north sequence (4A-J) showing about the first 30 seconds of the second eruptive pulse of July 22, 1980. Photographer 4A-J (photos nos. 3-12) taken at about 3-second intervals beginning at 1825:20±5 PDT; photograph 4J taken about 6 seconds after 4I. Arrow (4H) indicates projection from pyroclastic fountain. Dashed line (4H) indicates front of pyroclastic density flow. Skamania County, Washington. (Photos by J.W. Vallance; graphics on published photos only; see also MSH-July 22, 1980 nos. 5ct-15ct in USGS Photo Library) Published as figure 4-B in U.S. Geological Survey. Professional paper 1335. 1986. Index card unavailable.
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Album caption: Oblique aerial view of Mount St. Helens as viewed from the north, sequence (4A-J) showing about the first 30 seconds of the second eruptive pulse of July 22, 1980. Photographs 4A-J (photos nos. 3-12) taken at about 3-second intervals beginning at 1825:20±5 PDT; photograph 4J taken about 6 second after 4I. Arrow (4H) indicates projection from pyroclastic fountain. Dashed line (4H) indicates front of pyroclastic density flow. Skamania County, Washington. (Photos by J.W. Vallance; graphic on published photos only; see also MSH-July 22, 1980 nos. 5ct-15ct in USGS Photo Library) Published as figure 4-C in U.S. Geological Survey. Professional paper 1335. 1986. Index card unavailable.
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slides no. 5 through 25 were taken between 18:25:20 and 18:26:30 This sequence was taken while moving counter-clockwise from the north to the west flank of Mount St. Helens at a distance of about 7 miles and while changing elevation from about 10,000 to 12,000 feet. Approximate 3 seconds after slide no. 14. (Wing of aircraft visible). Skamania County, Washington. (Photo by J....
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Typed caption accompanying slide: Stereopair with slide no. 64 taken at 19:11. The plume encounters an atmospheric boundary and is planed off into an anvil shape at about 60,000 feet. Skamania County, Washington. (Photo by J. Vallance) Note: Slide numbers 43 - 50 were taken at 19:01 and show the pyroclastic flow as it advances northward. Skamania County, Washington. July 22, 1980. Slide number 51 was taken at 19:02. Slide numbers 52 - 55 were taken at 19:03. Slide numbers 56 - 57 were taken at 19:04. Slide numbers 58 and 59 were taken at 19:04 and 19:05. Slide numbers 60 - 62 are views of the eruption and were taken at 19:06. Slide no. 52, msh_vjw00052_ct, is highlighted in this photo record. Slide no....
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slides no. 5 through 25 were taken between 18:25:20 and 18:26:30 This sequence was taken while moving counter-clockwise from the north to the west flank of Mount St. Helens at a distance of about 7 miles and while changing elevation from about 10,000 to 12,000 feet. Approximately 3 seconds after slide no. 20. Skamania County, Washington. (Photo by J. Vallance, USGS) View of...
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slide no. 43 through no. 62 show the third eruptive pulse. this sequence was taken while moving clockwise from the west to the north side of the mountain at a distance of 7 to 10 miles and at an elevation of 17,000 feet. View of eruption at 19:03. Skamania County, Washington. (Photo by J. Vallance, USGS)
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Typed caption accompanying slides: Approximately 3 seconds after slide no. 6. The fountain of ash gives rise to a pyroclastic flow that sweeps over the ejecta rampart. Skamania County, Washington. (Large portion of wing of aircraft visible) (Photo by J. Vallance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken and Rick Hoblitt, who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They began at 17:14, 18:30 and 19:02 PDT....
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Typed caption accompanying slides: Approximately 3 seconds after slide no. 5. The plume grows. Skamania County, Washington. (Wind of aircraft visible) (Photo by J. Vallance) Typed caption accompanying slides: The 2nd eruptive pulse begins with the appearance of a dark, ash-rich projection. The white cloud above the crater is a lingering remnant of the mild steam emmission that occurred between the 1st and 2nd eruptive pulses. Skamania County, Washington. (Wing of aircraft visible) (Photo by J. Vallance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who...
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Typed caption not available. Note: Slide numbers 43 - 50 were taken at 19:01 and show the pyroclastic flow as it advances northward. Skamania County, Washington. July 22, 1980. Slide number 51 was taken at 19:02. Slide numbers 52 - 55 were taken at 19:03. Slide numbers 56 - 57 were taken at 19:04. Slide numbers 58 and 59 were taken at 19:04 and 19:05. Slide numbers 60 - 62 are views of the eruption and were taken at 19:06. Slide no. 52, msh_vjw00052_ct, is highlighted in this photo record. Slide no. 52 typed caption: View of eruption at 19:03, the plume develops a mushroom-like head while the elutriate cloud from the pyroclastic flow billows up through the cloud layer. Skamania County, Washington. (Photo...
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Typed caption accompanying slides: Approximately 3 second after slide no. 19. View from northwest. Ash cloud rising above the pyroclastic flow. Skamania County, Washington. (Photo by J. Vallance) Note: Mount St. Helens - List of color transparencies (slides) of the July 22, 1980 eruption. The following slides (1-114) of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken and Rick Hoblitt, who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They began at 17:14, 18:30 and 19:02 PDT. Additional note: Slides no. 5-25 were taken between 18:25:20 and 18:26:30....
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Album caption: Oblique aerial view of Mount St. Helens as viewed from the northwest at about 1826:30 PDT on July 22, 1980, about 13 seconds after the view shown in figure 5 (photo no. 13). Note that a vertical column is forming rapidly. Highest point on the eruption cloud is about 4,100 m above the highest point on the rim of the amphitheater. Skamania County, Washington. (Photo by J.W. Vallance; similar to MSH-July 22, 1980 no. 25ct) Published as figure 5 in U.S. Geological Survey. Professional paper 1335. 1986. Index card unavailable.
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slides no. 5 through 25 were taken between 18:25:20 and 18:26:30 This sequence was taken while moving counter-clockwise from the north to the west flank of Mount St. Helens at a distance of about 7 miles and while changing elevation from about 10,000 to 12,000 feet. Approximately 3 seconds after slide no. 20. Skamania County, Washington. (Photo by J. Vallance, USGS) 18:26:14.
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. 20:53 Mount St. Helens from the west; moderating activity at sunset. Skamania County, Washington. (Photo by J. Vallance, USGS)
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. 2#1:01 Mount St. Helens from the northwest; moderating activity at sunset. Skamania County, Washington. (Photo by J. Vallance, USGS)
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These slides of the July 22, 1980 eruption of Mount St. Helens were taken by Jim Vallance, who was in a U.S. Forest Service fixed wing aircraft and by Mike Doukas, Harry Glicken, and Rick Hoblitt who were in a U.S. Geological Survey helicopter. There were three major eruptive pulses on July 22, 1980. They begin at 17:14, 18:30 and 19:02 PDT. Slides no. 5 through 25 were taken between 18:25:20 and 18:26:30 This sequence was taken while moving counter-clockwise from the north to the west flank of Mount St. Helens at a distance of about 7 miles and while changing elevation from about 10,000 to 12,000 feet. Approximately 3 seconds after slide no. 20. Skamania County, Washington. (Photo by J. Vallance, USGS) 18:26:20....


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