3-D Joint Inversion of the Full Impedance Tensor and Magnetic Transfer Function in Atedai Geothermal Area Case

Abstract

Magnetotelluric (MT) sounding is a powerful geophysical method to explore the Earth's interior structure using its electrical conductivity. This method had been done in Atedai geothermal area is located in Province of East Nusa Tenggara, Indonesia. The existence of geothermal system is characterized by fumarole, hot springs, hot pools, mud pools, hot grounds, and alteration rocks by temperature 35 - 980C. By using WSINV3DMT code of 3-D inversion, we do full impedance tensor and vertical magnetic transfer function or tipper to represent the 3-D Earth. The computation of WSINV3DMT depend on the size of data (N), not the size of model parameter (M). We use 30 MT stations, 12 number of frequencies, and 40 × 48 × 28 blocks in xyz component to recover this research area. In the end, we compare with or without using tipper in 3-D inversion. Joint 3-D inversion of full impedance tensor and vertical magnetic transfer function is more realistic than without using tipper.