IDENTIFICATION OF UNDERGROUND STRUCTURE OF OPAK FAULT LINE IN PATEN SUBVILLAGE WITH GEOELECTRIC METHOD USING DIPOLE-DIPOLE CONFIGURATION

Abstract

This research was aimed to determine the distribution of resistivity value and to identify
underground structure of Opak fault line in Paten subvillage using geoelectric data. Research location
was located in Paten subvillage, Srihardono village, Pundong subdistrict, Yogyakarta. It has
geographical coordinates of 7o 56’34,2’’S to 7o56’54.94’’S and 110o21’38.44’’E to 110o21’58.22’’E. The
method used was geoelectric method with dipole-dipole configuration based on resistivity value of rocks.
Data acquisition used Naniura NRD 22 S resistivitymeter. The measurements were conducted for 3 lines.
The results showed that the value of resistivity for first line is between 0,056 to 2000 Ωm, second line
was about 0,705 to 2700 Ωm, and for third line was about 2,16-1300 Ωm. Subsurface structure in Opak
fault line in Paten is dominated by clay with resistivity value of 1-100 Ωm, limestone with resistivity value
of 500-10000 Ωm and alluvium with resistivity value of 1-20 Ωm .
Keywords: geoelectric method, dipole-dipole configuration, Opak fault, Paten subvillage