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Abstract
We have inverted magneto telluric (MT) data collected in nine states of the northwestern United States as a part of the EarthScope project for 3D imaging of electrical resistivity to a depth of 500 km using recent advances in extremely largescale electromagnetic modeling and inversion. The results of our mega-cell 3D inversion reveal multi-scale geo electrical in homogeneities in the upper mantle, which are closely related to major known tectonic features. Our geoelectrical model clearly shows a resistive structure associated with the Juan de Fuca slab subducting beneath the northwestern United States, and the conductive zone of partially melted material above the subducting slab due to the release of fluids from the down going slab. We observe extensive areas of moderate-to-high conductive asthenosphere below 100 to 200 km. The geoelectrical model also shows a prominent conductive feature associated with the partially melted mantle plumelike layer of the Yellowstone hotspot. These results correlate reasonably well with P-wave and S-wave velocity models independently obtained from seismic tomography.
Highlights
The deep geological structure of the northwestern United States and southwestern Canada has been extensively studied by seismologists during recent years with the deployment of the National Science Foundation (NSF) EarthScope project’s USArray program, managed by the Incorporated Research Institutions for Seismology (IRIS), and regional seismic networks [1,2,3]
Obrebski et al [3], demonstrated that the subducting Juan de Fuca slab is clearly imaged by their P and S-wave tomographic models, which show a low velocity anomaly associated with the Yellowstone hotspot
The conductivity distribution as recovered by our 3D inversion of the EarthScope MT data reflects the regional features of the northwestern United States
Summary
We have inverted magneto telluric (MT) data collected in nine states of the northwestern United States as a part of the EarthScope project for 3D imaging of electrical resistivity to a depth of 500 km using recent advances in extremely largescale electromagnetic modeling and inversion. Our geoelectrical model clearly shows a resistive structure associated with the Juan de Fuca slab subducting beneath the northwestern United States, and the conductive zone of partially melted material above the subducting slab due to the release of fluids from the down going slab. The geoelectrical model shows a prominent conductive feature associated with the partially melted mantle plumelike layer of the Yellowstone hotspot. These results correlate reasonably well with P-wave and S-wave velocity models independently obtained from seismic tomography
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