Identifikasi Struktur Geologi Dasar Laut Sulawesi Berdasarkan Anomali Magnetik
DOI:
https://doi.org/10.26418/pf.v7i3.36110Abstract
Penelitian ini bertujuan untuk mengetahui struktur geologi di Laut Sulawesi dengan menggunakan metode magnetik. Data yang diperoleh dari hasil survei yaitu data intensitas medan magnet. Pengolahan data awal dilakukan koreksi harian dan koreksi IGRF (International Geomagnetic Reference Field) pada data hasil survei untuk mendapatkan anomali medan magnet total. Kemudian di reduksi ke kutub dan selanjutnya dilakukan pemisahan anomali lokal dan regional dengan filter gaussian regional/residual untuk mendapatkan anomali lokal. Didapatkan nilai anomali magnetik pada daerah penelitian -290,0 nT hingga 335,6 nT. Berdasarkan anomali magnetik dan pola struktur daerah penelitian, diduga adanya Struktur geologi yaitu sesar. Variasi nilai intensitas medan magnet merupakan parameter dalam menentukan nilai suseptibilitas. Nilai suseptibilitas Laut Sulawesi yaitu 0,0656 SI hingga 0,0677 SI. Berdasarkan nilai suseptibilitas, struktur geologi daerah penelitian didominasi batuan jenis andesit, basaltik, dan batuan metamorf.
Kata Kunci: Metode Magnetik, Struktur Geologi, Suseptibilitas, Anomali Magnetik
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Date: 24-05-2023
Prisma Fisika
Email: prismafisika@physics.untan.ac.id
