Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005: Chapter 26 in A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006

Professional Paper 1750-26
This report is Chapter 26 in A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006. For more information, see: Professional Paper 1750
By: , and 
Edited by: David R. SherrodWilliam E. Scott, and Peter H. Stauffer

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Abstract

Airborne surveillance of gas emissions began at Mount St. Helens on September 27, 2004. Reconnaissance measurements--SO2 column abundances and CO2 , SO2 , and H2 S concentrations--showed neither a gas plume downwind of the volcano nor gas sources within the crater. Subsequent measurements taken during the period of unrest before the eruption began on October 1 and for several days after October 1 showed only small point sources of gas within the crater. These sources defined a pattern of scrubbed degassing that evolved from near-zero emissions, to scattered CO2 -only sources, to growing sources of CO2 with minor H2 S and SO2 , and finally to myriad sources of CO2 with increasingly SO2 - dominant sulfur gases. Scrubbing strongly hydrolyzed SO2 but also affected CO2 and H2 S.

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Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005
Series title Professional Paper
Series number 1750-26
DOI 10.3133/pp175026
Year Published 2008
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Volcano Hazards Program
Description 29 p.
Larger Work Type Report
Larger Work Subtype USGS Numbered Series
Larger Work Title A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006 (Professional Paper 1750)
First page 543
Last page 571
Country United States
State Washington
Other Geospatial Mount St. Helens
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