The Sensitivity of Maximum Magnitude Range Parameter in Bedrock Acceleration Calculation for 2500 Years of Return Period, Case Study: Bengkulu Province, Indonesia

Abstract

Abstract Infrastructure development such as multi-storey buildings, toll roads, bridges, housing, and others continue to be carried out to improve the economic region. Those things require planning and a good foundation in order to have a durable and earthquake-resistant building. Earthquake is one of the most destructive geological hazards and can trigger other geological hazards, such as landslides, tsunamis, liquefaction, and land subsidence. Bengkulu Province, Indonesia, is one of the susceptible areas to this hazard. The earthquake hazard assessment is important to do to reduce the risk of material and immaterial loss. This study aims to determine the sensitivity of the maximum magnitude range parameter using the probabilistic seismic hazard analysis (PSHA) method using USGS PSHA software. The result obtained from this study were in Bengkulu Province with all earthquake sources show the value of bedrock acceleration with 2500 years of return period in the range 1.2 – 1.5g. The observed sensitivity shows that Bengkulu Province has a sensitivity value in range of 0.01 – 0.03 with the highest value being in Bengkulu City with a value (0.02722) due to uncertainties of maximum magnitude with range of (+0.1) Mw and the fault source indicates that Lebong has a value of (0,05890742).