1. Where is the Hot Rock and Where is the Ground Water – Using CSAMT to Map Beneath and Around Mount St. Helens
- Author
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Adam R. Mosbrucker, Jeff Wynn, Kurt R. Spicer, and Herbert A. Pierce
- Subjects
geography ,Environmental Engineering ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Aquifer ,Volcanism ,010502 geochemistry & geophysics ,Geotechnical Engineering and Engineering Geology ,01 natural sciences ,Tectonics ,Geophysics ,Volcano ,Magnetotellurics ,Magmatism ,Economic geology ,Igneous petrology ,Geomorphology ,Seismology ,Geology ,0105 earth and related environmental sciences - Abstract
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.
- Published
- 2016
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