“…This has been achieved despite the relatively low inherent background resistivity of the basin-filling sediments due to abundant contained clays and evaporitic deposits. Localized areas of anomalously low resistivity have been identified at all the geothermal fields in the Trough which have been extensively explored by deep drilling (Meidav and Fergerson, 1972;Charre-Meza et al, 2000;Jensen et al, 1990). These include the Salton Sea, Brawley, Heber, East Mesa, and Cerro Prieto fields.…”