a pressure gradient sensor for seismic and other applications utilizing the principle of diamagnetic drift . the sensor comprises at least one transducer , each transducer made of or containing a medium having at least one species of mobile charged particles such as electrons or holes that exhibit diamagnetic drift under a pressure gradient . a magnet and a pair of electrodes are installed in each transducer . diamagnetic drift current collected by the electrodes can be measured by an ammeter or similar device , and formulas and methods are disclosed to determine the pressure gradient from the measured current .