The catastrophic, explosive eruption of Mount St. Helens, Washington, on May 18, 1980, is the most well-known eruption of the volcano. Less well known is the May 18th eruption marked the beginning of a period of eruptive activity that lasted through 1986. From October 1980 through October 1986, a series of 17 dome-building episodes added millions of cubic meters of lava to the crater floor. Most of the growth occurred when magma extruded onto the surface of the dome, forming short (650 to 1,300 feet), thick (65 to 130 feet) lava flows. This data release is a 1-meter resolution digital elevation model (DEM) and a corresponding hillshade raster derived from a previously unpublished 1:2,000 scale topographic contour...
Tags: Cascade Range,
DEM,
Geography,
Mount Saint Helens,
Mount Saint Helens National Volcanic Monument, All tags...
Pacific Northwest,
USGS Science Data Catalog (SDC),
United States of America,
Volcanology,
Washington,
elevation,
geology,
geoscientificInformation,
lava,
volcanic activity,
volcanoes,
volcanology, Fewer tags
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