system to provide earthquake early warnings by detection and location of subsurface geologic perturbations which relate to seismic activity and for passive and active use of electromagnetic derived signals to locate oil bearing strata, such system comprised of computer hardware, electronic hardware, computer software and sensors, namely, remote sensors, modems, receivers, a mainframe computer with a controller, and computer software to correlate and interpret the detected signals; a system used for detection and location of sub-surface mineral and hydrocarbon bearing structures, such system comprised of computer hardware, electronic hardware, transmitter and associated antennas, a receiver, and computer software to analyze the signal returns; a subsurface mapping system for detection and location of sub-surface water resources and underground utility infrastructure, such system comprised of computer hardware, electronic hardware, transmitter and associated antennas, a receiver, and computer software to analyze the signal returns