3D DC geoelectric resistivity modeling with the singularity removal technique using finite element method based on orthosceme element.

As a commonly used method for near-surface surveys, there is a demand for lightweight, fast, and accurate 3D DC geoelectric resistivity modeling that can be execute on portable computers. This study employed a singularity removal technique, solving the primary potential equation analytically and the secondary potential equation numerically using the finite element method. The modeling domain was discretized using orthosceme elements derived from dividing a hexahedron into six elements.

VLF-EM data conversion into apparent resistivity using the Hilbert transform and its application for shallow fault investigation at Pinggirsari, Bandung Regency, Indonesia.

This research presented the ability of the Hilbert transformation of The Very Low Frequency-Electromagnetic (VLF-EM) data to investigate the presence of faults. VLF-EM data was collected in the Pinggirsari village area, Arjasari District, Bandung Regency, West Java, Indonesia. Through the Hilbert transformation, the VLF-EM data was converted into apparent resistivity data and then inverted into a resistivity cross-section.