PENGAMATAN ANOMALI ULF FASE PRA-SEISMIK UNTUK PREKURSOR GEMPA BUMI DI LAUT MALUKU PERIODE NOVEMBER-DESEMBER 2014
Keywords:
ULF, anomali, prekursor gempa bumi, metode polarisasi ratioAbstract
Gempa bumi besar di Laut Maluku pada 15 November 2014 Mw 7,1 dan 21 Desember 2014 Mw 6,3 telah dilakukan pengamatan prekursor dengan anomali ULF. Data MAGDAS dari stasiun Manado (MND) , Pare-Pare (PRP) dan Sicincin (SCN) diolah sejak 31 Oktober hingga 31 Desember 2014. Untuk menginvestigasi anomali ULF sebelum gempa bumi digunakan metode analisis polarisasi rasio komponen Z dan H (SZ/SH) dan polarisasi rasio komponen horizontal stasiun utama dan referensi(SH1/SH2). Indeks DST perlu dibandingkan dengan hasil polarisasi untuk memastikan anomali saat hari tenang berasal dari aktivitas litosfer. Berdasarkan hasil kedua metode di atas diperoleh adanya anomali sebelum gempa bumi terjadi dengan lead time 14 hari untuk gempa Mw 7,1 dan lead time 4 hari sebelum gempa Mw 6,3.
Kata kunci : ULF, anomali, prekursor gempa bumi, metode polarisasi rasio
References
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