The area surrounding the peak of Mount Saint Helens (WA) before and after its eruption in 1980. The digital elevation models (DEMs) used were downloaded from the Geomorphological Research Group of the U. of Washington (http://gis.ess.washington.edu/data/raster/thirtymeter/mtsthelens/) and I do not know the precise date of either elevation survey (though it is evident from the resurgent dome in the post-eruption model that it was not immediately following the eruption. The red material contains most of the 2.07 cubic km of material that is “missing” from the more resent DEM. Part of Lower Manhattan is shown floating in the caldera for scale modified from sketchup models shared at 3D Warehouse by jwdoney https://3dwarehouse.sketchup.com/user.html?id=0394287310658687781132289 and XcLusiveGTtriLLa https://3dwarehouse.sketchup.com/user.html?id=0466694825847329493350611 The purpose of the model is to communicate the scale of geological processes (in this case, a “medium-sized” explosive volcanic eruption).
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