FAULT ANALYSIS IN POHGAJIH VILLAGE, BLITAR, INDONESIA USING RESISTIVITY METHOD FOR HAZARD RISK REDUCTION

A fault estimation has been done in Pohgajih village, Selorejo subdistrict, Blitar district, Indonesia using geoelectric resistivity, dipole-dipole configuration. The study was conducted using Resistivity meter OYO MacOHm. This study aims to analyze the existing fault track at the study site. The analysis of the fault is expected to provide information on the impact of the settlement of villagers in Pohgajih Village. The data acquisition is performed on five measurement tracks with a track length of 150 meters. Visual surveys show that in Pohgajih Village, there are points where people's homes are fractured and severely damaged, and a slanted electric pole as the ground continues to move every year. Based on the interpretation of the resistivity data and the correlation with the visual survey results, the cracked and severely damaged house points were in the low resistivity range. The resistivity varies from 3.4 to 9.8 Ω.m and interpreted as clay. If traced based on the interpretation of resistivity data and visual surveys then it can be assumed that there is an additional fault, in addition to one track already contained on the geological map. The first fault corresponds to geological information based on the Blitar Sheet Geology Map. However, with the presence of severe damage dwellings at other locations, it is suspected that a second fault is located in the northern part of the first fault. Both faults lead from Northwest to Southeast and are suspected as strike slip fault.