Honors College Thesis
 

A magnetotelluric investiagation of shallow conductivity sources beneath the Cascadia Volcanic Arc

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  • The Cascade Volcanic Arc has been the subject of extensive study in the past due to its active volcanism and its proximity to metropolitan areas. The triangle formed by the volcanoes Mount Saint Helens, Mount Rainier, and Mount Adams is of particular interest because of this potential danger and the geological complexity of the area. Anomalously high conductivity, known as the Southern Washington Cascades Conductor (SWCC), was detected in portions of the region and attributed to trapped marine sediment and partial melt from volcanism in different studies. The magnetotelluric method was used to study the shape and potential causes of the SWCC through acquiring surface electric and magnetic field data throughout the region in 2014, as part of the NSF funded iMUSH project. A linear northeast-to-southwest profile of stations was analyzed to produce a two-dimensional conductivity cross-section through inversion. The best fitting conductivity model was checked with the preexisting studies and found to confirm the existence of the SWCC in certain areas. The model also showed signs of marine sediment and volcanism presence in different portions of the region, though geological complexity and data set limitations prevented a definitive conclusion from being drawn.
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  • Indirectly financially supported by the GeoPRISMS and Earthscope programs of the US National Science Foundation (NSF).
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