USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Catastrophic Flooding and Eruption of Ash-Flow Tuff at
Medicine Lake Volcano, California
--
Julie M. Donnelly-Nolan and K. Michael Nolan, 1986,
Catastrophic Flooding and Eruption of Ash-Flow Tuff at
Medicine Lake Volcano, California:
Geology, v.14, p.875-878.
Abstract
Catastrophic flooding has eroded a discontinuous network of
oversized anastomosing channels on the northwest flank of the Medicine Lake
volcano. Most of these previously unrecognized channels were cut into an
andesitic ash-flow tuff; boulders as large as 2 m in intermediate diameter
were moved in terrain where little rain falls today and stream erosion is
nonexistent or minimal. The flooding was probably triggered by eruption of
andesite tuff through a late Pleistocene ice cap on the volcano. The
andesite tuff is dated at 173-143 ka (Herrero-Bervera and others, 1994).
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06/06/01, Lyn Topinka