Analysis of potential destructive earthquakes in the seulimeum fault – North

• Main Authors: Sugito, Zulham, Umar, Muksin, Idris, Yunita, Jihad, Abdi, Banyunegoro, Vrieslend H., Rusdin, Andi Azhar
• Format: Conference Proceeding
• Language: English
• Subjects: Density; Earthquakes; Geological faults; Geological hazards; Segments; Seismic hazard; Seismicity; Stress concentration; Subduction (geology)
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0201152

Earthquake activities in Aceh Province are caused by the Sumatran Fault Zone and the West Coast Subduction Zone. Recent Research suggested that there are 13 Active Fault Segments in the Aceh region. Since 1938 – 2018 there were 21 destructive earthquakes occurred in Aceh. Destructive earthquakes were dominated by the source of active fault segment in the Aceh region, one of the active faults with destructive earthquakes is the Seulimeum Fault – North. This research aims to determine the level of seismicity in the Seulimeum Fault - North area using the Gutenberg Richter (Log=a−bM) method. Then it is used to calculate surface density and earthquake recurrence times. The results are then used to model the worst scenario of a destructive earthquake along Seulimeum Fault – North, so that the level of earthquake hazard potential risk can be determinated. The data used in the research based on the priority of the sources Sumatran Fault epicenter as earthquake catalog in the Aceh region from 2010 to 2021 with geographical boundaries of 1° - 6 ° Latitude and 94.0° - 99.0° Longitude and magnitude>1, depth less than 30 km. The results of the analysis figure that the Seulimeum Fault – North has a surface density (B-value) around 0.2 – 0.6. It was assumed that the area has a high concentration of fault stress or currently accumulating energy and has the potential to generate a severe earthquake in the future. The recurrence times of destructive earthquakes in the Seulimeum Fault – North with a time span of 47.66 - 59.12 years and the maximum magnitude release is estimated to be M≤8 implying a high level of potential hazard risk.