Simulasi Pendugaan Kedalaman Jalur Konduktif Bawah Permukaan Dengan Probabilitas Tomografi Geolistrik = Depth Estimation of Subsurface Conductive Track Simulation Using Geoelectric Probability Tomography

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2002
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/23942/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=6906
• Institution: Universitas Gadjah Mada

ABSTRACT Application of Probability Tomography methods in order to determine high conductivity zone in a medium has been conducted. The input data are electric potential on the surface of the medium with varied conductive pipe-like inside. Those potential have been calculated by 3D geoelectric forward modeling using finite different method. All models are flat topography. Boundary condition techniques which give the smallest error between potential calculated using finite different method and potential calculated with analytic solution on the surface have been applied. Root mean square error is 4.29% single current source on the surface and less than 4% at some depths. This is agreed with numerical modeling condition. Probability tomography has been applied to a line of potential which taken from calculated potential on the surface. The result is tomogram images, i.e., probabilities of occurrence conductive zone as a function of depth beneath the line. Analysis to the cross section shows that the center of nuclei, always relate with conductive pipe-like, especially for horizontal conductive pipe-like and step like subsurface conductive pipe-like (with height difference on each side). But, for a case of branched conductive pipe-like, this method cannot resolve the response from separate conductive blocks except the top of measured potential profiles are visually separated. Keywords: probability tomography, conductive track, cross section analysis