A new type of electromagnetic (EM) receiver has been developed by integrating four capacitive electrodes and a triaxial induction coil with an advanced data logger for tunnel exploration. The new EM receiver can conduct EM observations in tunnels, which is one of the principal goals of surface-tunnel-borehole EM detection for deep ore deposit mapping. The use of capacitive electrodes enables us...

[1] Constraints on bulk conductivity from magnetotelluric measurements and petrological analyses of late Quaternary peridotite xenoliths from the southern Sierra Nevada allow evaluation of models commonly used to relate electrical conductivity to the physical and chemical state of the upper mantle. In these models, two conductive melts (basalt and sulfide) are embedded in a resistive matrix. Bo...

Significant geoelectric fields are produced by the interaction of rapidly varying magnetic with conductive Earth, particularly during intense geomagnetic activity. Though usually harmless, large or sustained can damage grounded infrastructure such as high-voltage transformers and pipelines via geomagnetically induced currents (GICs). A key aspect understanding effects space weather on is throug...

among all the geophysical techniques, the magnetotelluric method has improved considerably in recent years and is widely being used in hydrocarbon exploration especially in regions where reflection seismic has difficulties. areas which are covered with high velocity rocks in the near surface are most popular cases. a huge high resolution magnetotelluric investigation was conducted in the sehqan...

Induction vectors represent geomagnetic transfer functions used in magnetotellurics and related passive electromagnetic sounding methods geophysics. They are obtained from the measurements of variation carry information on distribution local regional electric resistivity subsurface, which can be interpreted terms geology tectonics. The underlying concept their interpretation works properly if s...