Mapping of Peak Ground Acceleration (PGA) Values using the Donovan Model for Sumatran

Abstract

The island of Sumatra is characterized by three tectonic systems, which are sequentially from west to east consisting of an oblique subduction zone with gentle subduction angles, the Mentawai fault, and the Sumatran large fault zone (Semangko fault). These three tectonic systems have caused high seismic activity and have implications for ground movement (Peak Ground Acceleration). This research calculates the PGA value using the Donovan model based on historical data from 100 years of destructive earthquakes. The results of this calculation are mapped and obtained results that have similarities with the tectonic system, where the west coast is a high-risk area for ground movement. The model gives PGA results in the range 8.5508 - 368.1172 gal with a minimum value of 3.295° N, 95.982° E caused by earthquake 9.1 SR, Andaman Island. The maximum value is at 4.436° S, 101.076° E caused by earthquake 5.2 SR, Bengkulu. In general, this map provides an overview of the risk of land movement on the island of Sumatra and can be used for land movement disaster mitigation efforts.