Temporal Change of Spectra and Lyapunov Exponent Volcanic Tremor at Raung Volcano, Indonesia
Arin Wildani1, Sukir Maryanto2

1Arin Wildani, Doctoral Student, Department of Physics, Brawijaya University, Malang, Indonesia. 

2Sukir Maryanto, Department of Physics, Brawijaya University, Malang, Indonesia.

Manuscript received on 10 January 2020 | Revised Manuscript received on 06 February 2020 | Manuscript Published on 20 February 2020 | PP: 163-167 | Volume-9 Issue-3S January 2020 | Retrieval Number: C10360193S20/2020©BEIESP | DOI: 10.35940/ijitee.C1036.0193S20

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open-access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Spectral Analyses and estimation maximal lyapunov exponent (MLE) of volcanic tremor recorded at Raung Volcano were carried out to investigate dynamical systems regarding to their generating system. Their results of both analyses can explain the temporal change in frequency and deterministic processes of the dynamical system. Spectral analysis of volcanic tremor was estimated by the average periodogram method which includes division, Fast Fourier Transformation and averaging. MLE was estimated by graphing the relationship between Stretching Factor (S) and the number of points in the tractor (N) diagram. Content frequency of volcanic tremor Raung Volcano is range from 2.68 to 3.7 Hz. Temporally, there is no significant change, which means that there is no change in the geometry of the Raung volcanic tremor source. This is also shown by the maximal lyapunov exponent which is temporarily constant and positive. That shows that the source process of Raung volcano is chaotic.

Keywords: Raung Volcano, Volcanic Tremor, Maximal Lyapunov Exponent, Spectral Analysis.
Scope of the Article: Bio-Science and Bio-Technology