H. Jayadi, B.J. Santosa, D.D. Warnana, Z. Zulfakriza, R. Jamroni, P. Supendi, S. Rosalia, F. Muttaqy, G. Rachman, A.S. Putra, A.D. Wijaya, I.U. Meidji
The Palu Koro Fault, which frequently causes solid and destructive earthquakes, is the most exciting aspect of Central Sulawesi's tectonics. We used local earthquake data from the area in this preliminary study. Our preliminary investigation entails analyzing local seismic data and estimating the velocity structure and hypocenter location using a tomographic approach that employs P-wave arrival times from the Agency for Meteorology, Climatology, and Geophysics earthquake observation network from 2010 to 2019. We use a 1-D initial velocity structural model in this tomographic inversion method, and the results are evaluated using the checkerboard test, derivative weight sum, and ray hit count. To the west and east of the Palu Koro Fault area, preliminary tomographic inversion results show a relatively high seismic velocity. These areas are interpreted as West Sulawesi Mandala and East Sulawesi Mandala Poso Fault and Wekuli Fault. The low-velocity anomaly is found near the Palu Koro Fault. Because of the high-speed thrusting, the relocated hypocenters also clustered around the Palu Koro Fault area. In the following activity, we will determine the speed structure of the S wave, which is expected to provide better geological information in the interpretation. © Published under licence by IOP Publishing Ltd.
Department of Physics, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia; Geophysical Engineering Study Program, Faculty of Mathematics and Natural Sciences, Universitas Tadulako, Palu, 94148, Indonesia; Department of Physics, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia; Department of Geophysical Engineering, Faculty of Civil, Planning and Geo Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia; Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia; Center for Earthquake Science and Technology (CEST), Research Center for Disaster Mitigation, Institut Teknologi Bandung, Bandung, 40132, Indonesia; Agency for Meteorology, Climatology and Geophysics (BMKG), Makassar, 90231, Indonesia; Agency for Meteorology, Climatology and Geophysics (BMKG), Jakarta, 10720, Indonesia; Research Center for Geological Disaster, National Research and Innovation Agency of Indonesia (BRIN), Bandung, 40135, Indonesia; Physics Education-FKIP, Universitas Pattimura, Molucca, 97233, Indonesia; Graduate Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia; Physics Study Program, Faculty of Mathematics and Natural Sciences, Universitas Tadulako, Palu, 94148, Indonesia; Physics Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Gorontalo, Gorontalo, 96128, Indonesia
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