Matano Fault

Together with the Palu-Koro Fault, this fault zone forms part of the boundary between two of the major crustal blocks that form the island, the North Sula Block to the north and east and the Makassar Block to the south and west. The current slip rate along the Matano Fault is estimated to be in the range 17 to 28 millimetres (0.67 to 1.10 in) per year.^[3][1]

No earthquake has been recorded along the Matano fault zone for at least 200 years. Paleoseismic investigations on some of the segments have revealed evidence of past ruptures. Five faulting events have been detected along the easternmost Geresa segment of the fault, three in the last 1,000 years. The most recent is dated to between 1432 and 1819 with a rupture length of ~110 km and an estimated magnitude of ~7.4 M_w. The recurrence interval interpreted from these observations is 335±135 years, suggesting that a further rupture is likely due.^[1]