Induced Polarization In The Detection Of Cave Systems

2D Induced Polarization (IP) surveys were carried out across a protile extending over the<br>North Canyon of the Indian Echo Caverns in Hershey, Pennsylvania . In this<br>presentation, we show the resulting images from inverted IP data. We expect zero<br>chargeabilities in the areas which correspond to the cavity/void (air) and relatively higher<br>chargeabilities in the areas which correspond to the surrounding water saturated rocks.<br>The resulting contrast provides the mechanism for detection of cave systems. The data<br>was inverted using a robust 2D IP modeling/inversion code.