Johnston Ridge Observatory
24000 Spirit Lake Highway
P.O. Box 326
Toutle, WA 98649
VolcanoCam Movies Archive
Eruption Event Movie - October 11, 2004
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Below the Flash movie may be a copy of the press release as issued the same day
by the U.S. Geological Survey, Cascades Volcano Observatory, Vancouver, Washington.
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(As issued by the U.S. Geological Survey, Vancouver, Washington
University of Washington, Pacific Northwest Seismograph Network, Seattle, Washington)
Seismic activity remained at a low level overnight. Small earthquakes
(maximum about magnitude 1) continue to occur at a rate of about 1 per
5 to 10 minutes. Visual observations and thermal imaging of the crater,
the 1980-86 lava dome, and the intensely deforming and uplifting area
on the south side of the dome were made yesterday afternoon. Thermal imaging
of the western part of the uplifting area revealed temperatures of 500
to 600 degrees C on a large pinkish-gray fin of rock and in nearby fumaroles
and cracks. These observations are consistent with new lava having reached
the surface of the uplift. Additional visual and thermal observations
will be made today to further evaluate this interpretation.
A gas-sensing flight yesterday measured fluxes of sulfur dioxide and
carbon dioxide that are similar to or slightly smaller than those measured
on 7 October. The next gas-sensing flight is scheduled for tomorrow.