An update of the local 1-D seismic velocity model and the relocation of the hypocenter of the aftershocks of the M7.4 earthquake, September 28, 2018 around the Palu-Koro fault has been done. A total of 415 aftershocks events were used in this study with 5,626 P waves and 836 S waves recorded at 29 BMKG seismograph stations. Relocation using the VELEST algorithm (Kissling, 1995) with initial seismic velocity input in the form of a 1-D model which is a combination of Koulakov et al (2007) for shallow depth (less than 24 km) and the global seismic velocity model AK135 (Kenneth et al., 1995) for depths of more than 24 km. The results of aftershock hypocenter relocation at the Palu-Donggala earthquakes showed better results marked by a hypocenter distribution pattern that was closer to the geological conditions of the Palu-Koro fault. Other results, the local seismic velocity model for the Palu-Koro fault area and its surroundings are expected to be suitable for use in further studies around the Palu-Koro fault. Keterangan: Poster ini telah dipresentasikan pada International Symposium and IORA Workshop on Lessons Learnt from the 2018 Tsunamis in Palu and Sunda Strait, Jakarta 26-28 September 2019. Sitasi: Anshori, M., and Sembiring, A.S., (2019): Hypocenter Relocation of September 28, 2018 Palu- Donggala Earthquake Aftershocks and 1-D Seismic Velocity Model of Palu-Koro Fault System, International Symposium and IORA Workshop on Lesson Learnt from the 2018 Tsunamis in Palu and Sunda Strait, Jakarta 26-28 September 2019, Poster.

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