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2005 September 20

USGS Update 2005-Sep-20 10:00

Potential ash hazards: Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that any ash clouds that rise above the crater rim today would drift eastward.

Recent observations: Field crews are out again today. A camera positioned on the old lava dome will run for several hours taking repeat photographs of a small area of the active part of the new lava dome. The aim of this experiment is to determine the rate of lava extrusion and to see if it is occurring steadily or in fits and starts that might correlate with changes in rates of seismicity or in tilt of the ground surface around the vent. Our hope is to better understand the process by which lava is extruding from the vent. Other work will focus on resurveying some targets on the new lava dome and continue studies of some prehistorical features of the volcano.