GIS BASED ON ANALYSIS OF EARTHQUAKE HAZARD LEVEL USING THE PGA IN SIBERUT - MENTAWAI ISLANDS REGENCY FOR SUSTAINABILITY IN DISASTER MITIGATION

The research aims to investigate and map the distribution of epicentre depth, magnitude, and Peak Ground Acceleration (PGA) values against earthquake hazards as well as evaluate the numerical parameters that influence the magnitude of earthquake hazard values. This research uses the Geographic Information System (GIS) and kriging analysis as well as algebra to create an earthquake hazard map. The parameters used include the spatial distribution of epicentres in the ocean, epicentre depth, and PGA values. In addition, statistical analyses were conducted to identify variables affecting the spatial distribution of earthquake hazards. The research results show that the research area on Siberut Island, which is part of the Mentawai Islands has a scattered earthquake distribution. Epicentre depths ranged from 6.10 km to 107.60 km with an average depth of 30.13 km, indicating that most of the earthquakes were shallow. The magnitude of the earthquakes ranged from 3.50 to 7.60 Mw with an average of 4.63 Mw. PGA values ranged from 89.57 gal to 283.17 gal with the highest values found in areas with shallow epicentres and high earthquake intensities. This research provides important contributions for policymakers in island spatial planning, sustainable development, earthquake, and tsunami hazard mitigation.