SUMEDANG EARTHQUAKE RELOCATION PERIOD DECEMBER 31, 2023 – JANUARY 4, 2024 USING DOUBLE DIFFERENCE METHOD

Ninda Maftuha, Tati Zera, Mochamad NurFaizi

Abstract


On December 31, 2023, an earthquake occurred in Sumedang with a magnitude of M=4.8. The location of the epicenter is at coordinates 6.85'S and 107.94'E, or precisely on land at a distance of 2 km northeast of the center of Sumedang City, with a hypocenter of 5 km. This earthquake is categorized as a shallow earthquake (M<60) caused by active fault activity that has not been previously mapped. This research aims to relocate the hypocenter of the earthquake in the Sumedang area using the Hypocenter Double Difference (HypoDD) method to be more accurate. The data used is data arrival time BMKG on December 31, 2023 - January 4, 2024, in the Sumedang, with regional restrictions 107.93'E - 107.96'E and 6.76'S - 6.85'S. This study shows Root Mean Square (RMS), which is better than before the relocation. Based on the results, the hypocenter obtained was 12 km, and a cluster was formed at 6-10 km depth. The results of the hypocenter of this earthquake are related to tectonic conditions in the Sumedang area, namely the suspected existence of an active fault.

Keywords


Double Difference; Earthquake; Hypocenter; HypoDD; Relocation; Sumedang

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DOI: https://doi.org/10.18860/neu.v16i2.26552

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