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Magnetotelluric survey of the Cascade volcanoes region, Pacific Northwest



Magnetotelluric survey of the Cascade volcanoes region, Pacific Northwest



SEG Abstracts 1981(1): 16



The deep electrical structure beneath the Cascade Range volcanoes and adjacent provinces has been studied using data from 97 magnetotelluric soundings, covering frequencies from 0.0015 to 100 Hz. Widely spaced soundings on six east-west profiles spaced from Mt. Lassen on the south to Mt. Rainier on the north enabled comparison of electrical structure in the main ridge of the Cascades to that in the Klamath Mountains-Coast Range terrains, the Basin and Range terrain of eastern Oregon and northern California, and the Columbia Plateau. In addition, more detailed surveys were completed in caldera systems at Medicine Lake, Calif., and Newberry Crater, Oreg., and across the contact between the High Cascades and Western Cascades in central Oregon. Soundings suitable for interpretation were modeled with one- and two-dimensional models. Some corrective measures were necessary for some of the data that had parallel splits between the transverse electric (TE) and transverse magnetic (TM) data covering the complete frequency range. Procedures modified from those described in Berdichevsky and Dimitriev (1976) were used to treat data with such parallel splits. Models for the MT data can be grouped for three regions: (a) Basin and Range and High Cascades of northern California and eastern Oregon; (b) Western Cascades, Klamath Mountains-Coast Range; and (c) Columbia Plateau.

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