Identifikasi Anomali Sinyal Geomagnetik Ultra Low Frequency Sebagai Prekursor Gempa Bumi Dengan Magnitudo Kecil Di Wilayah Kepulauan Nias

Authors

  • M. Hamidi M. Hamidi Jurusan Fisika FMIPA Universitas Andalas, Kampus Unand, Limau Manis, Padang, 25163, Indonesia
  • Elistia Liza Namigo Jurusan Fisika FMIPA Universitas Andalas, Kampus Unand, Limau Manis, Padang, 25163, Indonesia
  • Ma’muri Ma’muri Badan Meteorologi Klimatologi dan Geofisikai, Padang Panjang, 27118, Indonesia

DOI:

https://doi.org/10.25077/jif.10.1.53-62.2018

Abstract

Telah dilakukan identifikasi anomali sinyal geomagnetik frekuensi rendah sebagai prekursor gempa bumi dengan magnitudo kecil di wilayah Kepulauan Nias. Pada penelitian ini digunakan data gempa dari bulan September 2016 hingga bulan Juni 2017 dengan rentang waktu data geomagnetik yang digunakan 30 hari sebelum terjadinya gempa bumi. Data geomagnetik ini adalah data yang terekam oleh sensor Magnetic Acquisition Data System (MAGDAS). Penyeleksian data gempa bumi dilakukan dengan menerapkan persamaan radius daerah persiapan gempa yaitu  Pengolahan data geomagnetik dilakukan dengan menggunakan metode Power Spectrum Density (PSD) untuk menganalisis rasio komponen SZ/SH medan magnet bumi dan menggunakan metode Single Station Transfer Function (SSTF) untuk menentukan arah azimuth yang dihasilkan oleh anomali Ultra Low Frequency (ULF).  Selanjutnya, untuk memastikan sumber anomali digunakan validasi indeks Disturbance Storm Time (DST). Dari hasil pengamatan diperoleh 3 kejadian gempa bumi dengan anomali ULF sebelum terjadinya gempa. Gempa bumi tersebut adalah gempa 13 Oktober 2016 dengan magnitudo 3,3, gempa 16 November 2016 dengan magnitudo 3,6 dan gempa 16 April 2017 dengan magnitudo 3,2. Lead time anomali ULF untuk ketiga gempa ini memiliki durasi yang lebih pendek dibandingkan dengan lead time anomali ULF untuk gempa bumi dengan magnitudo besar yang pernah terjadi di Pulau Sumatera.

Kata kunci: sinyal geomagnetik, ultra low frequency, prekursor, gempa magnitudo kecil, kepulauan nias

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Published

2019-09-25

How to Cite

M. Hamidi, M. H., Namigo, E. L., & Ma’muri, M. (2019). Identifikasi Anomali Sinyal Geomagnetik Ultra Low Frequency Sebagai Prekursor Gempa Bumi Dengan Magnitudo Kecil Di Wilayah Kepulauan Nias. JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS, 10(1), 53–62. https://doi.org/10.25077/jif.10.1.53-62.2018

Issue

Vol. 10 No. 1 (2018): March 2018

Section

Research Article

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