Lateral variations of electrical conductivity in the lower mantle constrained by Swarm and CryoSat-2 missions
Jakub Velı́mský, Ondřej Knopp
Abstract
Abstract The electrical conductivity is an important geophysical parameter connected to the thermal, chemical, and mineralogical state of the Earth’s mantle. In this paper, we apply the previously developed methodology of forward and inverse EM induction modeling to the latest version of satellite-derived spherical harmonic coefficients of external and internal magnetic field, and obtain the first 3-D mantle conductivity models with contributions from Swarm and CryoSat-2 satellite data. We recover degree 3 conductivity structures which partially overlap with the shape of the large low-shear velocity provinces in the lower mantle.
Topics & Concepts
Mantle (geology)GeophysicsGeologyElectrical resistivity and conductivityElectromagnetic inductionInverseConductivitySatelliteGeodesyPhysicsGeometryMathematicsQuantum mechanicsAstronomyElectromagnetic coilGeophysical and Geoelectrical MethodsHigh-pressure geophysics and materialsSeismic Waves and Analysis