12-spirit_lake-6-85_ig_adj
14-pkg_lot_adj
09-spirit_lake-6-85_ig_adj
15-j&stump2-6-85_ig_adj
20-devastated_area-6-85_ig_adj
19-overlook_view-6-85_ig_adj
21-ash&veg-6-85_ig_adj
18-log_in_ash-6-85_ig_adj
4-22-bar_on_toutle_ig_adj
toutle_mudflow_adj
mt_st_helens_adj
IMG 6346
Healing
Mt. St. Helens
07-wrecked_car-6-85_ig_adj
05-blowdown_in_devastated_area-6-85_ig_adj
03-trees_devastated_area-6-85_ig_adj
02-mt_st_helens-6-85_ig_adj
Douglas fir stump
17-spirit_lake-6-85_ig_adj
Broken truss bridge
17-bkn_truss_bridge-5-86_ig_adj
Mt. St. Helens
12-devastated_area7_ig_adj
15-devastated_area8_ig_adj
10-devastated_area6_ig_adj
09-devastated_area5_ig_adj
06-devastated_area4_ig_adj
24-spirit_lake-9-86_ig_adj
05-devastated_area3_ig_adj
04-devastated_area_ig_adj
02-mt_st_helens_ig_adj
01-spirit_lake_ig_adj
25-overlook-9-86_ig_adj
00-mt_st_helens3_ig_adj
27-j&sara_in_blowdown_ig_adj
23-spirit_lake-9-86_ig_adj
26-j&sara_ig_adj
23-j&green_tree-6-85_ig_adj
25-blowdown&smoke-6-85_ig_adj
22-green_in_devastated_area-6-85_ig_adj
Mt. St. Helens from the flank of Mt. Adams
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Driftwood in Spirit Lake
From the May 1980 eruption of Mt. St. Helens, Washington state, USA. Spirit Lake was enlarged due to damming by the mudflow when the north side of the mountain blew out. Still 5 years later much of the surface is covered with floating logs.
William Sutherland, have particularly liked this photo
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slgwv club has replied to Tractacus clubFar larger eruptions have occurred in the geologic past. Huge "welded tuffs" (a.k.a. "ignimbrites") occur across much of the US west. These are ash-flow units in which the ash was still hot enough to weld together when it settled out--and some of these units extend for _miles_. Originally the ash must have extended much farther, but was not hot enough to weld. J. Hoover Mackin, who first studied these rocks in detail, said that "Tertiary eruptions of the Great Basin would compare with those of modern times as the explosion of a hydrogen bomb to the bursting of a firecracker." (American J. of Science, 1960). You usually can't get phrasing like that past the referees! The youngest such units are the Bishop Tuff in California, about 600K years old, and the Yellowstone Tuff. Such eruptions are the source of the concern about "supervolcanoes", which have recently gotten popular attention.
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