IDENTIFICATION OF BARIBIS FAULT SEGMENT IN UJUNGJAYA AREA THROUGH A GEOMORPHOLOGICAL AND MORPHOTECTONIC APPROACH
CIRIA HUMANIS BRILIAN 1, GALIH AJI MAHENDRA 1, ASTYKA PAMUMPUNI 2, IMAM ACHMAD SADISUN 2

1. Environmental Geology and Hydrogeology Laboratory, Padjadjaran University (UNPAD),
2. Geological Engineering Study Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology (ITB)

Abstract

Baribis Fault is one of the active faults in Indonesia with a reverse movement which extending from Majalengka to Subang and suspected even to Jakarta. Baribis Fault is the northern part of back arc imbrication in West Java. Several studies have been carried out regarding the geometry of the Baribis Fault. However, not many studies have examined the exact location of the Baribis Fault segment. Therefore, it is very interesting to study the exact location of the Baribis Fault segment using a geomorphological and morphotectonic approach. The aim of this research is to determine the location of the Baribis Fault segment which extends in the Ujungjaya area and its surroundings, Sumedang Regency, West Java. The data used in this research is DEMNAS data with a resolution of 8 meters. This research consists of two stages, namely the stage of analyzing the exact location of the Baribis Fault and field validation. The first stage is identifying the location of the Baribis Fault segment in the research area. Identification of the location of faults is carried out using a geomorphological approach consisting of geomorphological analysis, density of geological structure lineaments, and identification of knickpoints. Meanwhile, the second stage is field identification to look for evidence of fault geological structures at the location of the Baribis Fault segment that has been identified in the first stage. Based on geomorphological analysis, lineament density, and identification of knickpoints, it was found that the location of the Baribis Fault segment in the research area is at initial coordinates 107 56 45,5 E and 6 38 14,2 S which extends eastward to coordinates 108 5 40,2 E and 6 43 16,7 S. The Baribis Fault segment has a length of 20,06 km which extends from the west to the east of the study area. Several further studies need to be carried out regarding its activity and the hazards it can cause.

Keywords: Baribis Fault, geomorphology, knickpoint, morphotectonic

Topic: Solid Earth Sciences