Overburden Effect Examination Of Cubical Anomaly Using Geometry Normalized Electromagnetic System (GNES) Equipment

The objective of this study is to examine an instrument of Geometry Normalized Electromagnetic System (GNES) with various size of physical model (n=100) of aluminum overburden and Cubical anomalies for the master curves. The GNES instrument is relatively not sensitive to geometrical factors (geometry normalized), i.e., the distance, height differences, and angle between transmitter and receiver coils. Simultaneous transmissions of two electromagnetic waves with different frequencies will induce an eddy current in cubical anomaly. This current in turn will produce secondary electromagnetic fields which are measured by the receiver together with the primary fields. Measurement of percent change of vertical component of the field will give the percent response caused by the cubical. As a result that the master curves of the cubical anomalies is similar to a square (overburden) master curve pattern. The contrasts of anomaly are low for cubical anomaly and cubical with overburden anomaly but high in overburden anomaly.