The Ore Bin - Oregon Department of Geology and Mineral Industries

120 100 80 60 40 20
Movement in mm per day
Sherman
Figure 5. Relative motion of ice-surface foliations in
Sherman Crater, July 12, 1975 to August 1,1975.
covered it with heavy snows, scientists continue to monitor the volcanic
activity. The seismometer and temperature sensors continue to telemeter
information from the crater rim, although the snow has buried the gas sensor,
and the Oregon Army National Guard continues to acquire infrared
thermographs whenever flying conditions permit low-level overflights.
Aerial photographs, taken from one of the Mohawks on November 15,
show that despite heavy snowfall nearly 13,000 square meters of the crater
area remain snow free. This figure confirms the estimates of heated ground
area provided by the thermographic imagery during the summer months. Several
minor flooding incidents on Boulder Creek earlier this fall have been
attributed to snow avalanches temporarily blocking the exit of the meltwater
from the crater through the East Breach of the rim. Sulfuric water
in dangerous concentrations frequently wash es down the Bou Ider Creek
drainage.
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