Publications

A random and neglecting impedance value changing in magnetotelluric (MT) data processing may affect on resistivity value of the subsurfaces. It results on missinterpretation of MT data. Hence, to solve that, it is necessarily required analysis of impedance tensor rotation. In this process, it is assumed that MT acquisition is in line with structure direction. The MT data used in this research was 2 lines, consisting of 15 stations in the Singkawang Basin. Then, the management process was done by comparing the MT data and it used analysis of tensor rotation and without tensor rotation. As the result, the research obtained that impedance tensor rotation had impact on RMS error value and dimension of resistive anomaly. Line 1 profile by analysis of tensor rotation had RMS error of 3.12% and 3.33% without using tensor rotation. Resistive anomaly resulted with analysis of tensor rotation reached 11500 meters and the width of anomaly was 5000 meters. In addition, resistive anomaly resulted without using tensor rotation could reach 11500 meters and the width of anomaly was 7000 meters. Further, line 2 profile using analysis of tensor rotation had RMS error of 2.68%, and 5.65% without using tensor rotation. Resistive anomaly resulted by analysis of tensor rotation was 7000 meters and the width were 10000 meters. Meanwhile, resistive anomaly resulted without using tensor rotation could touch 9000 meters and the width was 16000 meters. Based on the result obtained, it can be concluded that the usage of impedance tensor rotation in the 2D modelling of magnetotelluric can minimize error value and both models of line 1 and 2 have shown a difference of representative resistivity value, so that it decreases misinterpretation due to static effect, which is heterogeneity effect close to surface in the line 1 and vertical contact in the line 2.