N. Heryandoko¹ , Y.H. Perdana¹ , A.N. Vita¹ , S. Pakpahan¹ , S. Rohadi¹

¹BMKG

Abstract:

The Sulawesi region has complex tectonic conditions. One of the main sources of seismicity in the study area is the Palu-Koro fault activity with the application of left lateral strike-slip. On September 28, 2018, at 17.02.45 WIB (GMT + 7), an earthquake of M 7.4 occurred to cause a tsunami hazard in the areas of Palu and Donggala. BMKG sensor recorded 835 aftershocks until November 25, 2018. In this study we use 3D seismic‐wave velocity model with a grid size 1°×1° in the travel‐time calculations. The results of the relocation show the earthquake patterns along the Palu-Koro fault, and the Matano fault with shallow depth (d> 70km).