Ambient Seismic Noise Analysis Associated with the 2010 Eruption of Merapi Volcano Using Temporal Variations of Randomness and Background Noise
Joint Authors
Rakhman, Afif
Wahyudi, Afif
Budi Santoso, Agus
Humaida, Hanik
Suryanto, Wiwit
Source
International Journal of Geophysics
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-06-30
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
We present the combination of permutation entropy (PE) and power spectral density (PSD) analysis on continuous seismic data recorded by short-period seismic stations during the 2010 Merapi volcano eruption.
The calculation of PE aims at characterizing the randomness level in seismic noise, while the PSD parameters use to detect the background noise level in various frequency bands.
It was previously observed that a significant reduction of randomness before the volcano eruption could be indicated as one of the short-term precursors due to the lack of high frequencies (>1 Hz) in the noise wave-field caused by high absorption losses as the hot magma uprises to the upper crust.
The results show no significant reduction in signal randomness before the eruption series.
The characteristic of events during the preeruptive period and the crisis tends to be chaotic (PE in the range 0.9 to 1).
Further calculations show that the standard deviation in PE decreased in four days before the first eruption onset on 26 October.
PE was stable at the highest values (very close to 1) and gradually returned to the previous fluctuation after the eruption onset.
The level of background noise in the low- and high-frequency bands appeared to have the same tendency.
The two main eruptions correspond to the two highest peaks of noise levels.
American Psychological Association (APA)
Rakhman, Afif& Wahyudi, Afif& Budi Santoso, Agus& Humaida, Hanik& Suryanto, Wiwit. 2020. Ambient Seismic Noise Analysis Associated with the 2010 Eruption of Merapi Volcano Using Temporal Variations of Randomness and Background Noise. International Journal of Geophysics،Vol. 2020, no. 2020, pp.1-10.
https://search.emarefa.net/detail/BIM-1171399
Modern Language Association (MLA)
Rakhman, Afif…[et al.]. Ambient Seismic Noise Analysis Associated with the 2010 Eruption of Merapi Volcano Using Temporal Variations of Randomness and Background Noise. International Journal of Geophysics No. 2020 (2020), pp.1-10.
https://search.emarefa.net/detail/BIM-1171399
American Medical Association (AMA)
Rakhman, Afif& Wahyudi, Afif& Budi Santoso, Agus& Humaida, Hanik& Suryanto, Wiwit. Ambient Seismic Noise Analysis Associated with the 2010 Eruption of Merapi Volcano Using Temporal Variations of Randomness and Background Noise. International Journal of Geophysics. 2020. Vol. 2020, no. 2020, pp.1-10.
https://search.emarefa.net/detail/BIM-1171399
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1171399