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Debris Avalanches and Volcanic Landslides -
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Cascade Range - Debris Avalanche Maps and Graphics
Graphic, click to enlarge [Graphic,21K,GIF]
Mount St. Helens area showing May 18, 1980 devastation, including the debris avalanche
-- Modified from: Tilling, et.al., 1990

Pictogram, click to enlarge ["Pictogram",100K,InlineGIF]
Mount St. Helens May 18, 1980 Eruption Sequence
-- "Pictogram" by Lyn Topinka, 1998, Modified from: Brantley and Topinka, 1984, Earthquake Information Bulletin, v.16, no.2

Map, click to enlarge [Map,26K,InlineGIF]
Inferred minimum extent of Mount Shasta's debris-avalanche deposits in Shasta Valley.
-- Modified from: Crandell, 1989, USGS Bulletin 1861

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11/12/99, Lyn Topinka