Abstract
As part of EMSLAB, broadband magnetotelluric data have been collected and analyzed at 11 sites along an east‐west transect in the Oregon Coast Range. Using one‐ and two‐dimensional modelling, the Coast Range was found to consist of marine sediments about 4 km deep near the coast and volcanic rocks about 8 km deep farther inland. Willamette Valley consists of surficial conductive sediments to a depth of 1 km, which overlie an eastern extension of the rocks that compose the Coast Range. An east dipping conductor, at a depth of approximately 20 km, is associated with the upper surface of the subducting Juan de Fuca plate. Possible mechanisms for the high conductance are water‐saturated fractured basalts forming the surface of the plate, subducted sediments, and/or the dehydration of the subducting slab trapped by metamorphic layering within the lower crust. This conductor correlates with an east dipping reflector, 35–40 km below the eastern flank of the Coast Range, defined by COCORP profiling and thought to represent the surface of the subducting Juan de Fuca plate.
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