Riparian vegetation patterns within the blast,
downstream of blast, and airfall tephra zones of Mount
St. Helens are related to initial and secondary volcanic
disturbance, post-eruption fluvial landforms, channel
geometry, and streamflow characteristics. Vegetation
patterns were determined from species presence observed on
transects across landforms developed along the streams.
Distinct...
The 18 May 1980 eruption of Mount St. Helens, emplaced between 3-3.5 billion cubic yards (bcy) of poorly sorted material ranging from silt to boulders, extending from river mile (RM) 25 to RM 38 in the upper North Fork Toutle River drainage. Sediment yields from the debris avalanche were calculated...