Journal of Volcanology and Geothermal Research, 37, 205-231, 1989.
Excerpted from "Dynamics of Mount St. Helens' 1980 Pyroclastic
Flows, Rockslide-Avalanche, Lahars, and Blast"
Alfred S. McEwen (1) and Michael C. Malin (2), Department of
Geology, Arizona State University, Tempe, AZ 85287
(1) Now at: U. S Geological Survey, 2255 North Gemini Drive,
Flagstaff, AZ 86001
(2) Now at: Malin Space Science Systems, P. O. Box 910148, San Diego,
Pre- and Post-Eruption Digital Topography of Mount St. Helens
Pre- and post-eruption digital elevation maps (DEMs) of the Mount St.
Helens (MSH) area were acquired from the National Cartographhic
Information Center (NCIC), U. S. Geological Survey. The DEMs cover
7.5 X 7.5 minute quadrangles and have a spatial resolution of 30
m/pixel and are reproduced here at 11 m/gray level (DN). There is
about a 1-2 DN uncertainty in the values presented here for the
post-eruption map. The data sets were mosaiced and slightly low-pass
filtered (smoothed) in 16-bit, but are reproduced here in 8-bits.
A word of caution: these images were put onto this server
quickly in order to address a specific request. There may be
round-off or other quantitative error in them at the 1-2 DN level; if
quantitative measurements are to be performed, the origial data sets
should be obtained either from the authors, or from the NCIC.
Topography (8-bit)GIF = 458 KBytes
Shaded Relief ImageGIF = 221 KBytes
Topography (8-bit)GIF = 449 KBytes
Post-Eruption Shaded Relief ImageGIF = 217 KBytes