ANALISA KINEMATIK SESAR PALU-KORO SEGMEN PALU DAERAH WISOLO HINGGA WERA KABUPATEN SIGI PROVINSI SULAWESI TENGAH

Abstract

The Sulawesi Island is composed of a complex tectonic arrangement, one of the reasons for the complexity  of  the  tectonic  arrangement  in  Central  Sulawesi,  namely  the  presence  of  the  Palu-Koro  Fault  (Bellier, et al. 2001). This  research  discussed  the  tectonic  evolution and kinematics of the Palu Koro fault in the Palu segment from Wisolo to Wera, Sigi District,  Central  Sulawesi  Province  and  its  surroundings,  to  describe  the  succession  of  paleostress fields,  150  striations in the fault plane were measured in 5 paths of the measurement location. The stress inversion  method  developed  by  Delvaux  and  Sperner  (2003)  used  in  analyzing  the  stress  regime  to  determine  the  evolution of stresses that developed in the research area using the Win Tensor 5.0.1 application.  The  results  of  rock  deformation  stress  inversion  analysis  shows  the  order  of  4  orientations of the elongation axis, namely in the first phase with the Southwest – Northeast orientation, the  second phase with the South – North orientation, the third phase with the North West – South Southeast  orientation, and finally the fourth phase with the Northwest – Southeast orientation. Based on the results of  the reconstruction, the Palu-Koro Fault in the Palu segment from the Wisolo to Wera area was formed in the  first phase with a downward or oblique movement on the Southwest – Northeast elongation axis and the  Northwest – Southeast stress orientation with the stress regime type, namely strike slip