Abstract
Bromo volcano is one of a series of active volcanoes in Indonesia, located on the Tengger caldera, Probolinggo, East Java. Bromo volcano has increased volcanic activity in the end 2015 until early 2016. The research was conducted to determine the characteristics of volcanic tremors. The methods used to determine the characteristics of volcanic tremors are spectral analysis and cross-correlation waveform analysis. Spectrogram analysis obtained frequency value 1-8 Hz for volcanic tremor of Bromo Volcano. From the results of spectral analysis volcanic tremor, it’s can be seen the value of the frequency peaks irregular means the type of spasmodic tremor. Based on the pattern of the peaks of the tremor spectral analysis using 3 stations having the same pattern and the analysis of cross-correlation waveform volcanic tremor of Bromo volcano was indicated from the same source mechanism because the correlation coefficient value is good that ranged about 0.6 – 0.8.
Highlights
Bromo volcano is one of a series of active volcanoes in Indonesia, located on the Tengger caldera, Probolinggo, East Java
The research was conducted to determine the characteristics of volcanic tremors
The methods used to determine the characteristics of volcanic tremors are spectral analysis
Summary
1) Program Studi Magister Ilmu Fisika, Jurusan Fisika, Fakultas MIPA, Universitas Brawijaya 2) Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Brawijaya 3) Pusat Vulkanologi dan Mitigasi Bencana Geologi, Badan Geologi, Bandung. ABSTRAK Gunungapi Bromo merupakan salah satu dari serangkaian gunungapi aktif di Indonesia yang terletak di dalam kaldera Tengger, Kabupaten Probolinggo, Jawa Timur. Gunungapi Bromo mengalami peningkatan aktivitas vulkanik pada akhir tahun 2015 sampai awal tahun 2016. Penelitian dilakukan untuk menentukan karakteristik tremor vulkanik. Metode yang digunakan untuk menentukan karakteristik dari tremor vulkanik adalah analisis spektral dan analisis waveform cross correlation. Analisis spektrogram didapatkan nilai frekuensi 1-8 Hz untuk tremor vulkanik Gunungapi Bromo. Hasil analisis spektral tremor vulkanik Gunungapi Bromo dapat dilihat berdasarkan nilai puncak-puncak frekuensi yang tidak beraturan yang berarti tremornya tipe spasmodik. Berdasarkan Pola puncak-puncak dari analisis spektral tremor yang menggunakan 3 stasiun memiliki pola yang sama dan analisis waveform cross correlation tremor vulkanik Gunungapi Bromo diindikasikan berasal dari sumber mekanisme yang sama karena didapatkan nilai koefiesien cross correlaton cukup baik yang berkisar diantara 0,6-0,8
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