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StHelens.doc
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1993-04-17
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Mount Saint Helens
Mount Saint Helens is the youngest and most active of the
volcanoes dotting the Cascade range from northern California to
southern British Columbia. In late 1979 Mount Saint Helens came
to life after over a hundred years of slumber. A series of minor
eruptions created a summit crater, and in early 1980 the cone
began to swell ominously. On May 18, 1980 the north side of the
cone suddenly gave way in a giant landslide, releasing a gigantic
explosion which totally devasted the landscape for many miles to
the north and east. Roughly a cubic kilometer of ash spewed forth,
turning day into night for large parts of Eastern Washington, and
mud flows went racing down the valleys, eventually reaching the
Columbia river.
The "MtStHelensOld" DEM maps the mountain before the eruption,
and the "MtStHelensNew" DEM the mountain as it existed in September,
1980 after the eruption. Over the next few years a lava dome grew in
the floor of the crater, but the mountain has been quiet for some time
now. Both quadrangles are 7.5-minute DEMs, with points spaced by 30
meters both West to East and South to North in the Universal Transverse
Mercator coordinate system.
The StHelens.DEMset file will set up the rendering parameters.
Turn trees off to get a better feel for the "New" Mount St. Helens.
Select the DEM settings file in the first file requester that appears
when you Save Data from GeoRama program.