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Where is the hot rock and where is the ground water— Using CSAMT to map beneath and around Mount St. Helens

May 18, 2016

We have observed several new features in recent controlled-source audio-frequency magnetotelluric (CSAMT) soundings on and around Mount St. Helens, Washington State, USA. We have identified the approximate location of a strong electrical conductor at the edges of and beneath the 2004–08 dome. We interpret this conductor to be hot brine at the hot-intrusive-cold-rock interface. This contact can be found within 50 meters of the receiver station on Spine 5, which extruded between April and July of 2005. We have also mapped separate regional and glacier-dome aquifers, which lie one atop the other, out to considerable distances from the volcano.

Citation Information

Publication Year 2016
Title Where is the hot rock and where is the ground water— Using CSAMT to map beneath and around Mount St. Helens
DOI 10.2113/JEEG21.2.79
Authors Jeff Wynn, Adam R. Mosbrucker, Herbert Pierce, Kurt R. Spicer
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Environmental & Engineering Geophysics
Series Number
Index ID 70171561
Record Source USGS Publications Warehouse
USGS Organization Volcano Science Center

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