Filters: Tags: {"type":"Place","name":"skamania county, washington"} (X) > Date Range: {"choice":"year"} (X) > Types: OGC WFS Layer (X) > Types: Map Service (X)
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Album caption: Thermal infrared images of Mount St. Helens obtained prior to 1980 eruption sequence, showing the two historic thermal areas. Image shows thermal area A, a small area of weak fumarolic activity at The Boot, on north flank at 2,740 m (9,000 ft) elevation. On this late-summer morning, instruments were set to depict two levels of background heat emission - glaciers and few remaining snow patches as cold, and snow-free ground as warm. Skamania County, Washington. August 7, 1971. Published as figure 147-A in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Mount St. Helens Collection,
Photographers,
Skamania County, Washington,
U.S. Army Collection,
Volcanoes,
Album caption: Mount St. Helens, before and after the eruption of May 18, 1980. Painting by D. Molenaar, U.S. Geological Survey. Skamania County, Washington. (Same as MSH-Molenaar 1cp and 1ct) Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Molenaar, D. Collection,
Mount St. Helens Collection,
Mount St. Helens May 18, 1980,
Skamania County, Washington,
Volcanoes,
Album caption: Computer-generated elevation-difference images of Mount St. Helens produced by subtraction of digital terrain models. A. April 11,1980 minus August 5, 1972. Shows development of north peak 1. Skamania County, Washington. n.d. Published as figure 81-A in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Mount St. Helens Collection,
Skamania County, Washington,
Volcanoes,
photo print
Album caption: Computer-generated shaded-relief images of filtered digital terrain models of Mount St. Helens. Data were filtered by averaging pixel values over 3 x 3 areas. Increased uncertainty of contour location within snowfields appears as terraces (in southeast) and crevasses (in northwest). B. Model from photographs of May 12 and 16, 1980. Small discontinuity just south of Dogs Head is an artifact of the join between May 12 and day 16 digital terrain models. Skamania County, Washington. May 16, 1980. Published as figure 79-B in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Mount St. Helens Collection,
Pevears, D.R. Collection,
Photographers,
Skamania County, Washington,
Volcanoes,
Slide description and index card: Aerial views of the Mount St. Helens crater and eruptions from the north and northwest. C, These phreatic eruptions seemed to grow in slow motion because of the immensity of the scene. Some were powerful enough to throw out automibile-sized blocks of rock and ice. Skamania County, Washington. April 10, 1980. (Photo by John Whetten). Published as Figure 14-C in U.S. Geological Survey. Professional Paper 1249. 1982.
Mount St. Helens Eruption. May 30, 1980.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Hamilton, R. Collection,
Mount St. Helens Collection,
Photographers,
Skamania County, Washington,
photo print
Index card: Geologists at theodolite station at Timberline Viewpoint. Mount St. Helens in the background, with bulge especially prominent. Skamania County, Washington. May 1/2, 1980. Published as Figure 83 in U.S. Geological Survey. Professional Paper 1250. 1981.
Slide description and index card: Aerial view of the Mount St. Helens crater and eruptions from the north and northwest. E, By April 10, eruptions were coming from a single circular vent (shown by an arrow on published photo only) in the lowest part of the crater and almost directly below the position of the crater first seen on March 29. Traces of what probably was another, but now-dormant, vent can be seen to the right of the active vent, here steaming weakly. The active vent was about 30 feet across. Skamania County, Washington. April 10, 1980. (Photo by John Whetten). Published as Figure 14-E in U.S. Geological Survey. Professional Paper 1249. 1982.
Index card: View looking upstream at the Smith Creek drainage basin. Smith Creek, a tributary to Muddy River, was inundated by several feet of mud, and phreatic eruptions can be seen occurring through the mudflow. Note the trees stripped from the hills and fires burning on the hills; also the deposit of trees on and through the mudflow. On the left of the slide you can see water beginning to flow over the surface of the newly deposited mudflow. Skamania County, Washington. May 19, 1980.
Album caption: Computer-generated shaded-relief images of filtered digital terrain models of Mount St. Helens. Data were filtered by averaging pixel values over 3 x 3 areas. Increased uncertainty of contour location within snowfields appears as terraces (in southeast) and crevasses (in northwest). A. Model from photographs of August 5, 1972. Skamania County, Washington. August 5, 1972. Portion published as figure 79-A in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Mount St. Helens Collection,
Pevears, D.R. Collection,
Photographers,
Skamania County, Washington,
Volcanoes,
Slide description and index card: Aerial view of the Mount St. Helens crater and eruptions from the north and northwest. D, A moderate-sized eruption cloud obscured the crater as steam and ash drifted eastward. Skamania County, Washington. April 10, 1980. (Photo by John Whetten). Published as Figure 14-D in U.S. Geological Survey. Professional Paper 1249. 1982.
Slide description and index card: Aerial view of the Mount St. Helens crater and eruptions from the north and northwest. A, The oblong crater, enlarged since the merging of two smaller pits, continued to grow with the repeated eruptions and avalanches from the crater walls. The summit graben had slumped noticeably since March 30, as the prominent offset (scarp) along the major crack (fault) on the southern side (back) of the crater shows. Skamania County, Washington. April 10, 1980. (Photo by John Whetten). Published as Figure 14-A in U.S. Geological Survey. Professional Paper 1249. 1982.
Album caption: Computer-generated elevation-difference images of Mount St. Helens produced by subtraction of digital terrain models. B. May 12/16 minus April 11, 1980. Development of north peak 2 during this period is shown as a second area of elevation increase north of the graben. Skamania County, Washington. n.d. Published as figure 81-B in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Mount St. Helens Collection,
Skamania County, Washington,
Volcanoes,
photo print
Index card: Peter D. Rowley and Norm Macheod in ramp area. Skamania County, Washington. August 11, 1980.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Embree, G.F. Collection,
Mount St. Helens Collection,
Photographers,
Skamania County, Washington,
Volcanoes,
Album caption: Thermal infrared images of Mount St. Helens obtained prior to 1980 eruption sequence, showing the two historic thermal areas. Images produced by the U.S. Forest Service for the U.S. Geological Survey. B. Image of April 26, 1973, showing thermal area on southwest flank at an elevation of 2,650-2,750 m (8,700-9,000 ft). The thermal features have a distinctive downslope linear trend. More snow was present at this time than in August 1971, with the result that thermal area A was covered by snow and does not appear in this image. Skamania County, Washington. April 26, 1973. Portion published as figure 147-B in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Mount St. Helens Collection,
Pevears, D.R. Collection,
Photographers,
Skamania County, Washington,
Volcanoes,
Slide description and index card: Aerial view of distal end of pyroclastic flow deposits (light gray) of the night of October 17, 1980 (O), just north of base of stairsteps, Mount St. Helens. Well-developed tongues and lobes beyond (north of) these deposits were emplaced on August 7, as were most of the deposits in the foreground. View looking south-southwest. Skamania County, Washington. October 18, 1980. (Letter on published photo only). (Photo by P.D. Rowley). Published as Figure 294 in U.S. Geological Survey. Professional Paper 1250. 1981.
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