Earthquake Active Zones in Southeast Sulawesi, Based on Hypocenter Relocation Using Double-Difference Method
DOI:
https://doi.org/10.56099/jrgi.v8i02.178Kata Kunci:
Earthquake Active Zones, Hypocenter Relocation, Depth Earthquake, Southeast SulawesiAbstrak
Zona aktif gempabumi dapat diidentifikasi berdasarkan distribusi hiposentrumnya. Terkadang, informasi mengenai kejadian gempabumi harus diberikan sesegera mungkin, sehingga hiposenter gempabumi tidak tepat. Sebuah katalog gempabumi yang telah direlokasi dengan menyertakan gempabumi lokal yang terekam oleh penambahan yang signifikan pada jaringan sensor seismik sangat diperlukan. Relokasi hiposenter gempabumi di Sulawesi Tenggara dilakukan dengan menggunakan metode double difference pada data event gempabumi periode Januari-Desember 2024, untuk menentukan zona aktif gempabumi. Data event gempa pada koordinat 02°45' - 06°15' Lintang Selatan dan 120°45' - 124°30' Bujur Timur. Proses relokasi hiposenter dengan menggunakan program hypoDD dan model kecepatan 1D ak-135, menghasilkan total 277 event gempabumi yang direlokasi menggunakan 21 lokasi sensor pencatat. Hasil relokasi hiposenter gempabumi terlihat jelas pada kejadian gempabumi yang berkumpul (berdekatan). Kedalaman gempabumi setelah relokasi adalah kedalaman dangkal (h<60 km), dengan nilai yang bervariasi, tidak hanya kedalaman 10 km atau lainnya. Pada tahun 2024 terdapat enam zona aktif gempa bumi, yaitu Kabupaten Kolaka, Kabupaten Kolaka Timur, Kabupaten Konawe Selatan, Kabupaten Konawe bagian Selatan, Kota Kendari, Pulau Kabaena, dan satu zona di perairan timur Sulawesi Tenggara (sebelah utara Pulau Wawonii, Kabupaten Konawe Kepulauan).
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