The North American continent has complex geological phenomena. Especially, in the western part of the continent are the Cascadian subduction zone (CSZ) and volcanic arc chain. Some hypotheses of the CSZ associated with volcanism commonly correspond with the low resistive anomalies. Here, 21 very low frequencies of the MT data from the USArray along Oregon to Wyoming were used to image the resistivity distribution below western part of America continent. The spacing between the measurement sites was 70 km. The two-dimensional (2D) inversion results of the MT data displayed some subduction slab approximately until the depth of 50 km. The CSZ corresponds to moderate resistive anomaly of 64 Ωm to 256 Ωm, and the Wyoming Craton was imaged as the resister that identified as stable archean lithosphere. The 2D MT inversion resulted in similar resistivity distribution with 3D MT inversion results for some depth. From this study, it can be concluded that the CSZ zone can be depicted in the western part and Wyoming Craton in the eastern part of study area
Rachmad Irman, Atria Dilla Diambama,, Sintia Windhi Niasari. (2017) Two-dimensional Regional Scale Resistivity Model of Western Part of United States of America based on Magnetotelluric Data, , Proc. of the PAS: A; 54, Issue 4.
