Relative present-day motion on Palu-Koro Fault

Abstract

Abstract Palu-Koro Fault (PKF) is an active fault zone in Sulawesi, Indonesia. PKF cuts across Palu city and bisects the Sulawesi Island into Makassar and North Sula blocks. Based on geodynamics reconstruction, the PKF is a transform fault that formed when two tectonic plates slid past each other. In this study, we determined the relative present-day motion on PKF (Latitude 0 Longitude 119) using PB2002 Model rotation pole calculation. From the Model, we could find that Banda Sea plate and Moluccas Sea plate are the plates that influence PKF activities. We attempt to calculate the magnitude and azimuth of velocity from the motion of Banda Sea plate and Moluccas Sea plate. The result shows that the Banda Sea plate is moving related to the Moluccas Sea plate at PKF with velocity 66.56 mm/a and azimuth 101.820° This method gives us a simple model from which provides a simple calculation for the development of geodynamics reference frame for present-day deformation studies in the Banda Sea – Moluccas Sea plate boundary and can give advice to the government for preparing hazard mitigation in the areas.

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