KARAKTERISTIK GEMPABUMI DI SESAR MATANO MENGGUNAKAN ANALISIS ENERGI KUMULATIF DAN PERIODE ULANG
DOI:
https://doi.org/10.20956/geocelebes.v4i1.8919Abstract
Aktifitas seismik Sesar Matano sangat tinggi di mana gempabumi sering dirasakan masyarakat dan mengakibatkan kerusakan di area sekitarnya. Identifikasi aktifitas gempabumi dengan mengetahui besarnya energi yang dilepaskan di 6 segmen pada Sesar Matano diperlukan untuk perencanaan mitigasi gempabumi. Dilakukan juga estimasi periode ulang gempabumi yang akan terjadi disertai kemungkinan energi yang akan dilepaskan oleh gempabumi di masa yang akan datang. Data yang digunakan adalah katalog gempabumi EHB dan BMKG tahun 1961-2019. Energi gempabumi dihitung dengan mengkonversikan nilai momen seismik ke dalam energi fisis gempabumi. Sedangkan nilai momen seismik didapatkan dari konversi magnitudo gempabumi. Nilai periode ulang didapatkan dengan membagi nilai slip rata-rata terhadap sliprate. Berdasarkan hasil pengolahan data yang dilakukan di 6 segmen berbeda, yaitu Segmen Kuleana, Pewusai, Matano, Pamsoa, Ballawai, dan Garessa masing-masing memiliki nilai potensi magnitudo maksimum yang sedikit berbeda dengan magnitudo maksimum yang dikeluarkan PUSGEN. Semakin besar potensi magnitudo maksimumnya, maka semakin lama pula potensi gempa tersebut akan kembali berulang.
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