Juellyan, Bambang Setiawan, Muttaqin Hasan, Halida Yunita, Munira Sungkar, Taufiq Saidi
The sudden release of energy from inside the earth, which generates seismic waves, causes earthquakes on the earth's surface. Foreshock, mainshock, and aftershock are terms commonly used in this subject. These phrases refer to the three stages of an earthquake event - before the main event, the primary event, and after the main event. The earthquake data catalogue, however, typically does not distinguish between mainshock data and foreshocks/aftershocks. For seismic-related studies, justifying the mainshock is very crucial. There are several methods for separating the mainshock of earthquake data from the foreshocks/aftershocks. This study employs three declustering techniques, including Gardner-Knopoff (1974), Gruenthal, and Uhrhammer (1986). The present study collected and analyzed 3543 earthquake events from 1971 to 2021 for Aceh region. In order to determine which method provides the highest a-value and b-value outcomes for Aceh's seismicity conditions, this study compares the aforementioned three approaches. The Uhrhammer method (1986) has an a-value of 5.82, a b-value of 1.05, 1893 main shock events, 305 clusters, and 3.3 percent of the total seismic moment generated at that location are the findings from this study. According to the Gruenthal method, the results had an a-value of 4.53, a b-value of 0.823, 776 mainshock events, 304 clusters, and released 1.3 percent of the total seismic moment at that location. a-value of 5.1, b-value of 0.929, 1097 main shock events, 319 clusters, and a release of 1.08 percent of the total seismic moment at that location were the results of the Gardner-Knopoff method (1974). For seismic hazard evaluation with the highest level of risk, the Uhrhammer (1986) technique is appropriate. The Gruenthal approach is suggested for more conservative cases. © Published under licence by IOP Publishing Ltd.
Doctoral Program, School of Engineering, Post Graduate Program, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Awardee, Program Riset Unggulan Universitas Syiah Kuala Percepatan Doktor (PRUU-PD), Lembaga Penelitian Dan Pengabdian Kepada Masyarakat (LPPM), Universitas Syiah Kuala, Indonesia; Program Study of Geological Engineering, Faculty of Engineering, Universitas Syiah Kuala, Indonesia; Department of Civil Engineering, Faculty of Engineering, Universitas Syiah Kuala, Indonesia
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