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Journal : Jurnal Geominerba

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IDENTIFIKASI ZONA SESAR MENGGUNAKAN PENDEKATAN GEOMORFOLOGI TEKTONIK DAN PEMETAAN GEOLOGI DI DESA BAN, KABUPATEN KARANGASEM, BALI Ida Bagus Oka Agastya; Putu Diyan Diwyastra; Suryo Hespiantoro
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 7 No 1 (2022): Jurnal Geominerba 2022
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1435.898 KB) | DOI: 10.58522/ppsdm22.v7i1.53

Abstract

This study focus on the movement of the fault that caused an earthquake on October 16, 2021 at 03:18:23 WITA with an earthquake magnitude of 4.8 Mw. The epicenter of the earthquake on land was at coordinates 115.45° East Longitude and 8.32° South Latitude with a depth of 10 km. The purpose of this study was to identify the presence of an active fault zone and to determine the fault kinematics in Ban Karangasem. The method used is SRTM DEM Image Analysis, Tectonic Geomorphology Approach, and Geological Mapping. Secondary data collected by GIS (Geographical Information System), and primary data collected by field surveying to observe the existing deformation and topography to determine the geometry and kinematics of an active fault. Focal Mecanism Analysis also used to determine the kinematics active fault, data sources published by BMKG. The results showed there are geological structures in the Buyan Beratan and Batur Purba Formation (Qpvb) and the Agung Volcano Formation (Qhva) in the study area. The geological structure is in the form of shear dan gash fracture, right slip fault, left normal slip fault, and left slip fault. The fault is classified as an active fault and cuts young rock, with an estimated fault zone length of 18 km with 5 fault segments. The existence of this fault zone is influenced by subduction activities in the south of Bali Island between the Eurasian Continental Plate and the Indo-Australian Ocean Plate.
SEBARAN DAN PROSES GEOLOGI PEMBENTUKAN LAVA TUBE KESAKSAK DI BATUR UNESCO GLOBAL GEOPARK Ida Bagus Oka Agastya; Putu Diyan Diwyastra; Suryo Hespiantoro; Dewa Ariana
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 8 No 1 (2023): Jurnal Geominerba - 2023
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v8i1.134

Abstract

Batur Volcano is an active stratovolcano located at Bali, in the area belongs to Batur Caldera as the the first UNESCO Global Geopark in Indonesia. Batur volcano produced lava, there are nine lava deposits resulting from the eruption of Mount Batur from 1849-1974. Many studies have been conducted to determine petrogenesis and the history of the eruption of Batur volcano, however, a more comprehensive study has never been carried out on the product of lava flows in the form of Lava Tubes/lava caves at Batur volcano. The research of Lava Tube focuses on the east side of Batur volcano where the 1888 lava flowed. Therefore, wecarried out field observation and analysis to interpret of the genesis Lava Tubes formation at Batur volcano. The Kesaksak Lava Tube at Batur Volcano was formed from the 1888 eruption of Batur Volcano, and the morphology forming tumuli which is referred to the tumulus cave lava. The lava flow that forms tumuli lava is caused by the rapid cooling of the lava surface then develops into a Lava Tube to form a lava flow further towards Lake Batur. The 1888 lava flow had a basalt composition with the character of the a'a lava. This supports the fact that the Lava Tube was not only formed in the pahoehoe lava flow. As one of the geosites in the Batur UNESCO Global Geopark area, the KesaksakLava Tube geosite has the potential to be developed as a geotourism object through the development of a geotrail that connects several geodiversities, biodiversity and cultural diversity in the Batur UNESCO Global Geopark area.
Co-Authors Dewa Ariana Ida Bagus Oka Agastya Ida Bagus Oka Agastya Suryo Hespiantoro Suryo Hespiantoro