[Geysers] Steamboat Geyser 21 February 2007 - analysis

[Ralph Taylor]

Hank Heasler and Cheryl Jaworowski of the Yellowstone Geology Program have
produced a report analyzing the activity of Steamboat Geyser on 21 February.
The work was done in response to the reports of a large steam cloud observed
at Steamboat and the subsequent draining of Cistern Spring.
 
The report includes photos of the area, graphs of stream flow at the
Tantalus Creek gauging station and temperatures in the runoff near the
bridge below Steamboat and a point downstream where the combined outflow
from Steamboat and Echinus contribute to the readings and at the Tantalus
Creek gauging station.
 
Based on undisturbed snow and ice and the lack of measurable flow or
temperature anomalies, Hank and Cheryl conclude that Steamboat did not have
a major eruption.  However, temperature readings taken at the boardwalk at
the Steamboat runoff channel suggest that there were forceful minor
eruptions on 11 February at 02:40 and 21 February at 02:00.  After both of
these periods of forceful activity the water flow decreased greatly as shown
by near freezing temperatures under the boardwalk.
 
If you are interested in the full report email me off the list at
ralpht at iglou.com for a .pdf containing the full report.
 
Ralph Taylor
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