UNDERGROUND INTERPRETATION OF POSSIBLE LANDSLIDE ZONE IN GERBOSARI VILLAGE, SAMIGALUH DISTRICT, KULONPROGO REGENCY USING GEOELECTRIC METHOD WITH DIPOLE-DIPOLE CONFIGURATION

Abstract

The research aimed to identify the underlying structure of probable landslide zone in Gerbosari village, and to
identify the depth of slip plane according to resistivity value. This research was conducted using resistivity method
with dipole-dipole configuration in Jetis subvillage, Jati subvillage and Dukuh subvillage, Gerbosari Village,
Samigaluh District, Kulonprogo Regency. The main instrument used for data collecting is resistivitymeter Naniura
NRD 22 S. The scope area of the research was 1,1 x 0,5 km consisted of 3 lines of survey while the precise location
of the research lied at coordinate of 7⁰39’54,90” S to 7⁰40’20,94” S and 110⁰10’02,79 E to 110⁰10’17,00” E. The
result of the measurement is processed using Res2dinv software that showed 2D layer. Geomorphological
characteristics are dominated by clay, sandy clay, limestone and andesite rock. In the layer of line 1 at Jetis
subvillage the resistivity value of slip plane is 147-489 Ωm with 7,19-8,50 meter of depth which is assumed as
layer of andesite. In the layer of line 2 at Jati subvillage the resistivity value of slip plane is 389-2171 Ω m with
6,33-8,50 meter of depth which is predicted to be layer of limestone. In the third layer of line 3 at Dukuh subvillage
the resistivity value of slip plane is 315-1293 Ωm and interpreted as limestone, while the depth of the slip plane
has not yet predicted.
Keywords: Geoelectric, slip plane, landslide, Gerbosari