USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Post-Glacial Lahars of the Sandy River Basin, Mount Hood, Oregon
--
Cameron, K.A., and Pringle, P.T., 1986,
Post-Glacial Lahars of the Sandy River Basin, Mount Hood, Oregon: Northwest
Science, v.60, n.4, p.225-237
Summary
During the last 10,000 years, at least 3 major eruptive periods have occurred at
Mount Hood. The oldest, and volumetrically largest, the Timberline eruptive
period, occurred between 1400 and 1800 years B.P. The Zigzag eruptive period,
volumetrically the smallest of the three, occurred between 400 and 600 years B.P.
The Old Maid eruptive period occurred between 180 and 270 years B.P. and its
aftereffects may have been witnessed by early explorers.
The combined clastic debris from these periods buried the southwest flank of the
mountain, producing a smooth debris fan. Lahars travelled at least 90 kilometers and
pyroclastic flows at least 13 kilometers from their source area near Crater Rock.
Flow-depths of the lahars probably averaged 8 to 12 meters in most cases.
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03/03/06, Lyn Topinka