ANALYSIS OF CIANJUR EARTHQUAKE IN 2022 USING OMORI, MOGI-UTSU I, MOGI-UTSU II AND UTSU METHODS
Abstract
This study aims to determine the decay time of aftershocks based on the earthquake frequency and the time of occurrence (days). The earthquake that was used as a case study was the Cianjur earthquake on November 11, 2022. The data used amounted to 384 aftershocks over 14 days. This data was obtained from social media by Dr. Daryono, S. Si, M. Si as the heads of the Earthquake and Tsunami Center-BMKG. To calculate the end time of aftershocks, empirical formulas are used from 4 methods, namely the Omori Method, the Mogi-Utsu I Method, the Mogi-Utsu II Method, and the Utsu Method. Various results with correlation coefficients related to the end of aftershocks were obtained from the results of the calculations using four methods. The most appropriate method to find out when the Cianjur earthquake will end is the Omori method, namely that the earthquake will end on the 86th day for n(t) = 1, assumed to end on February 5, 2022, with a coefficient of correlation of 0.761742.
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DOI: https://doi.org/10.15408/fiziya.v8i1.48662
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