Magnetotellurics is a method that uses natural electromagnetic currents in the Earth to infer which regions of the subsurface are more conductive or resitive to electric currents.
|What can we resolve with MT? These images show a series of simulations of different amounts of electric resistivity beneath a volcano and what real data might be able to determine. (Courtesy: Unsworth)|
Real data inversion from Mt. St. Helens (Hill et al., 2010)