H. Saputra, L.P. Siringorongo, C. Suhendi, L.K. Agustina
The ITERA observatory area is located on Mount Betung, which is adjacent to the Semangko active fault zone. This can be seen from the frequent occurrence of earthquakes in the western part of Sumatra. Therefore it is necessary to do mapping and research on the geological structure of Mount Betung. First, the identification of geological structure was carried out through Landsat 8 imagery with 753 composite bands. This composite band was the best in displaying geological structures. Seven geological structures were obtained in the form of faults at Mount Betung. 2 in the south, namely F1 and F2 faults, 2 in the north, F3 and F4 faults, and three faults around the Mount Betung peak, namely F5, F6, and F7. Some of these faults were strengthened by the discovery of 4 waterfalls in several parts of the fault. Talang Teluk waterfall on the fault in F1 fault, Talang Rabun waterfall on F2 fault, Gunung Betung waterfall on F3 fault, and Kubu Jambu waterfall in F4 fault. The four faults have an orientation towards the Northeast-Southwest. Joint data obtained in the field was processed to determine the type of fault. Based on joint data, it is estimated that faults in Mount Betung are normal faults. This fault is a normal fault system due to body force or gravity by its mass load. So that the active fault Semangko was not very influential on Mount Betung. © Published under licence by IOP Publishing Ltd.
Geology Research Group, Institut Teknologi Sumatera, South Lampung, Lampung, Indonesia