Program: Special Research Program for Disaster Prevention and Mitigation (SDM)
Field: Geological and Geo-Resource Engineering
Principal Investigator: Prof. Dr. Subagyo PRAMUMIJOYO
Sending University: Universitas Gadjah Mada (UGM)
Japanese Co-Investigator: Prof. Dr. Junji KIYONO
Japanese University: Kyoto University
One of the major structures in Central Sulawesi is the Palu-Koro Fault system, which extends NNW-SSE direction and cross cuts Sulawesi along 300 km, from Palu Bay southward turn to the SE connect to the Matano and Lawanopo Faults.
City of Palu at the northern tip of Palu depression is became a capital of the Central Sulawesi Province, Indonesia, so that the demographic development increase significantly, but this city is located in the active seismic zone. The Palu depression is up to 7 km wide and bordered by N-S oriented, up to 60 m high steep triangular facets and truncated alluvial fans at West side, and gently step faults at East side.
Based on structural lineament interpretation on DEM it can be determined the fault system. From several faults, combine with microtectonic observation on the ground, it can be estimated the magnitude of earthquake from fault sources. From lineaments it can be also choosen location of a trench in order to interpret the paleo-earthquake. After that, 180 single point with 1 km distance microtremor measurements have done and from every measurement showing the graphic of frequency (H/V) versus amplification. Three boreholes are going to drill accompany with vertical shear wave measurements.
We can increase our understanding on mitigation of earthquake hazard. The city of Palu can make a plan of the city development based on the result of our research.