International Journal of Basic & Applied Sciences IJBAS-IJENS Vol: 10 No: 06 151 104106-5757 IJBAS-IJENS © December 2010 IJENS I J E N S Model of Vertical Resistivity Distribution of Rock Layers in Jeneberang watershed *Muh. Altin Massinai , Syamsuddin, Makharani Geophysical Studies Program Hasanuddin University Makassar, Indonesia 90245 *Corresponding author’s e-mail: altin_muhammad@yahoo.com ABSTRACT Daerah Aliran Sungai (DAS) or Watershed is the accumulation of material from Jeneberang debris avalanche of Mount Bawakaraeng. The Resistivity material from several types of rock settling needs to be identified by using the geoelectric geophysical studies. Geoelectrical resistivity method used in this study aims to map the vertical layers of rock in the upstream and downstream of Jeneberang watershed. The results shows that resistivity values in the upstream of Jeneberang watershed is relatively high at around 300 - 2000 ohmmeter. This price indicates the value of plutonic rock of resistivity type. Around the downstream watershed of Jeneberang, resistivity value is relatively low, ie below 300 ohmmeter. This value indicates that in the downstream of watershed sediment rocks have experienced weathering. Keywords: avalanches, Jeneberang river, resistivity type, plutonic rocks I. INTRODUCTION 1. Background Mount Bawakaraeng and Jeneberang watershed are two phenomena in Gowa district area of South Sulawesi, which has the potential of strategic rock minerals. This is also a disaster that could potentially harm the public. Potential of mineral rock emerges from the avalanche of Mount Bawakaraeng containing plutonic rocks. It can be identified by plotting these rocks vertically . Geoelectrical resistivity method is categorized as an active method, this is because the artificial source of electric current is injected into the subsurface through the electrode. The current injected is then measured its responses and the electrical potential of the rocks. With the two variables, the size of each point of apparent resistivity measurement can be identified. Problems in the management of minerals in an area cannot be separated from the amount of resources and prospects of the layers (stratigraphy) of rock. Broadly speaking, the information available on the existence of minerals in a region is still very limited, both from the amount of reserves and the position and location of the mineral. It is very influential on the investment climate in the region, particularly in mining and mineral resources. Stratigraphy study on