A Data‐Driven Approach to Estimating Geoelectric Fields

Magnetotelluric Sampling and Geoelectric Hazard Estimation: Are National‐Scale Surveys Sufficient?

“…The severity of such geoelectric hazards is crucially dependent upon the three-dimensional electrical conductivity structure of the solid Earth (e.g., Bedrosian & Love, 2015;Cuttler, 2019;Kelbert, 2020;Marshall et al, 2019;Torta et al, 2017), as this dictates how geoelectric fields are induced within the Earth by external geomagnetic fields. Magnetotelluric (MT) impedance measurements (e.g., Unsworth, 2007), which establish the local surface relationship between the magnetic and electric fields, reflect subsurface electrical conductivity, and provide a means to quantitatively evaluate the hazard for grounded infrastructure (e.g., Boteler & Pirjola, 2017;Love et al, 2016).…”