Two-dimensional Regional Scale Resistivity Model of Western Part of United States of America based on Magnetotelluric Data | Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences 2017

Author(s)

Rachmad Irman Geophysics Laboratory, Department of Physics,Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta,Indonesia

Atria Dilla Diambama Geophysics Laboratory, Department of Physics,Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta,Indonesia

Sintia Windhi Niasari Geophysics Laboratory, Department of Physics,Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta,Indonesia

Abstract

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 Om to 256 Om, 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.

Publication Details

Page(s) 425-429

DOI DOI not available

Published Journal: Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, Volume: 54, Issue: 4, Year: 2017

Keywords

2D inversion MT data 2D model

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