H. Jayadi, N.R. Janat, B.J. Santosa, D.D. Warnana, A.D. Nugraha, H. Leopatty, I.F. Asyhar, I.U. Meidji, T. Fitriana, Ninasafitri
Last July 2021, a destructive earthquake occurred in the northern Ampana area, Central Sulawesi, with the epicenter at sea. We investigated the earthquake and found 101 hypocenter points with a magnitude of 2-6 Mw from 26 July to 18 August 2021 using the BMKG network. Of the 101 earthquakes, we relocated the hypocenter using the multiple difference method and obtained 75 earthquake events resulting from the relocation. The results obtained from the relocation are that several earthquake events with a fixed depth of 10 km have been updated. To validate the results, we used a histogram of travel time results, which depict the relocation results as good, and some close to zero. The results of the hypocenter relocation have a depth of 5 to 30 km and are collected in one location. The shift's direction and angle from the relocation results show that most of them are in a dominant direction to the north. It is interpreted that the earthquake was caused by force activity caused by the Balantak thrust, which is in the east and has a north direction towards the study site. © Published under licence by IOP Publishing Ltd.
Doctoral Program, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Indonesia; Geological Engineering Study Program, Faculty of Engineering, University of Tadulako, Indonesia; Department of Physics, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Indonesia; Department of Geophysical Engineering, Faculty of Civil, Planning and Geo Engineering, Institut Teknologi Sepuluh Nopember, Indonesia; Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Indonesia; Agency for Meteorology, Climatology and Geophysics (BMKG) Stageof Class, Palu, Indonesia; Physics Study Program, Faculty of Natural Science and Mathematics, Universitas Negeri Gorontalo, Indonesia; Geological Engineering Study Program, Faculty of Natural Science and Mathematics, Universitas Negeri Gorontalo, Indonesia
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