TY - JOUR
T1 - Mt. St. Helens
T2 - evidence of increased magmatic gas component
AU - Stoiber, Richard E.
AU - Williams, Stanley N.
AU - Malinconico, Lawrence L.
AU - Johnston, David A.
AU - Casadevall, Thomas J.
N1 - Funding Information:
Eggers of the University of Puget Sound are gratefully acknowledged for their assistance in obtaining samples from the eruption of 22 July. R.E.S. and S.N.W. gratefully acknowledge the assistance of David Burrington of NBC News and Clifford Williams. R.E.S., S.N.W., and L.L.M. whose research was supported by NASA Cooperative Agreement 5-22 and NSF grant EAR-8020796, acknowledge the continuing cooperation of U.S.G.S. personnel in Vancouver, Washington. S.N.W. also acknowledges Sigma XI support.
PY - 1981/12
Y1 - 1981/12
N2 - This paper presents measurements of SO2 flux and ash leachate chemistry from Mt. St. Helens volcano during the period May 18 to July 22 which are in contrast to similar data from before May 18. Comparison of post-18 May SO2 data with similar data from other volcanoes leads to the conclusion that between 15 and 25 May the SO2 flux reached typical magmatic levels. Ash leachate chemistry from the eruption of 18 May, 22 June and 22 July also indicate a large magmatic gas component. Concentrations of Cl- and SO2-4 on May 18 ash increase with distance from the volcano and decrease with time. Leachate chemistry is used to estimate that a minimum of 2.4 × 105 tons of S were released on May 18. Low F concentrations on the ash, though increasing, present to health hazards.
AB - This paper presents measurements of SO2 flux and ash leachate chemistry from Mt. St. Helens volcano during the period May 18 to July 22 which are in contrast to similar data from before May 18. Comparison of post-18 May SO2 data with similar data from other volcanoes leads to the conclusion that between 15 and 25 May the SO2 flux reached typical magmatic levels. Ash leachate chemistry from the eruption of 18 May, 22 June and 22 July also indicate a large magmatic gas component. Concentrations of Cl- and SO2-4 on May 18 ash increase with distance from the volcano and decrease with time. Leachate chemistry is used to estimate that a minimum of 2.4 × 105 tons of S were released on May 18. Low F concentrations on the ash, though increasing, present to health hazards.
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U2 - 10.1016/0377-0273(81)90023-8
DO - 10.1016/0377-0273(81)90023-8
M3 - Article
AN - SCOPUS:0001239727
SN - 0377-0273
VL - 11
SP - 203
EP - 212
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
IS - 2-4
ER -