Analysis of Seismicity Level in Central Sulawesi Period 1997-2017

Abstract

Indonesia is located at an active tectonic zone, due to the encounter of three main slabs in the world: Eurasia, Pacific, and Indo-Australian slabs. This lead to high earthquake level in Indonesia, one of them is in Central Sulawesi. The research was conducted in order to identify the a value, b value, and seismicity using the Maximum Likelihood method. Earthquake data from the USGS catalog and BMKG were used from 1997-2017 with magnitude (M) ≥ 3 and depth (h) ≤ 1000 km, located at-30 S-00 S and 1180 E-1240 E. The result showed that highest seismicity is located at the Eastern part of Central Sulawesi. The Mc value of 5,2, a value ranges 5-11,5 indicates high seismic activity, b value ranges 0,6-1,8 indicates high level of rock fragility and rock resistance levels to low stress. The result in this study effectively to observe the seismicity which can be used as guided for earthquake mitigation.