Identifikasi Sistem Panasbumi Wilayah Arjuno-Welirang Menggunakan Pemodelan Inversi 3D Metode Gayaberat.

Abstract

The Arjuno Welirang field is estimated to have a heat source that comes from under Mount Arjuno Welirang. The area of the Arjuno Welirang field is 21,280 ha covering Mojokerto, Pasuruan, Malang and Malang City Regencies. There are fumarole manifestations that appear around the peak of Mount Welirang which are identified as upflow zones and there are manifestations of thermal water that appear in Coban, Cangar, and Padusan which are identified as outflow zones. The data used in this study is secondary data obtained from GGMplus, the data obtained is in the form of free air anomaly, having a spacing of around 220 m. the distribution of CBA values correlates quite well with the lithology of volcanic breccias, lava, tuff breccias, and tuffs in the Arjuno-Welirang volcanic rock formations, this study area is dominated by quaternary rocks. 3D inversion modeling shows a high anomaly around Mount Arjuno-Welirang which is suspected as a basalt intrusion and is suspected as a source of heat.