The Relocation Of Bawean Earthquake Aftershock Using Double Difference Method
DOI:
https://doi.org/10.56099/jrgi.v7i01.147Keywords:
Earthquake, Bawean, Relocation, HypoDDAbstract
Gempa bumi yang terjadi pada tanggal 22 Maret 2024 di sekitar Pulau Bawean memicu serangkaian gempa susulan. Penelitian ini bertujuan untuk relokasi gempa susulan yang terjadi di sekitar Pulau Bawean dengan menggunakan metode Double Difference untuk meningkatkan akurasi penentuan hiposenter. Data yang digunakan dalam penelitian ini adalah katalog gempa bumi dari Stasiun Geofisika Malang, dengan total 878 kejadian yang dianalisis selama periode 22 Maret 2024 hingga 12 Juni 2024. Hasil relokasi menunjukkan adanya pergeseran lokasi hiposenter yang cenderung berkelompok di area barat laut Pulau Bawean. Secara visual, hiposenter yang direlokasi membentuk dua klaster yang jelas dengan orientasi barat-timur dan timur laut-barat daya. Nilai residual dari hiposenter yang direlokasi menunjukkan penurunan yang signifikan, mendekati nol. Perubahan signifikan diamati pada gempa bumi yang awalnya tercatat pada kedalaman 10 km, yang setelah relokasi menunjukkan variasi kedalaman yang berbeda-beda. Temuan ini menegaskan efektivitas metode Double Difference dalam memberikan penilaian bahaya seismik yang lebih akurat untuk wilayah tersebut.
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