Gliding and Quasi-harmonic Tremor Behaviour of Raung Volcano: November 2014 Crisis Period Case Study

Vico Luthfi Ipmawan, Kirbani Sri Brotopuspito, Hetty Triastuty

Abstract


DOI: 10.17014/ijog.5.1.13-21

The seismic activity of Raung Volcano was raised on 11 November 2014. As many as 1709 tremors were recorded followed by continuous tremors appearing in late November 2014. Quasi-harmonic and gliding tremors appeared in a spectrogram on 12 November 2014. The quasi-harmonic tremors refer to tremors that have no fully harmonic form in spectrum. The gliding harmonic tremors refer to harmonic tremors that have frequency jumps with either positive or negative increment. After signal restitution processing, the Maximum Entropy Spectral Analysis (MESA) method was applied in Raung recordings resulting the spectrum and the spectrogram of tremors. The quasi-harmonic tremors have the monotonic spectrum in its head and centre segment, and the harmonic one in its tails. There are twenty-four spectrums that show frequency changes between the monotonic and harmonic. The similarity between the fundamental frequency range of the monotonic and harmonic ones suggests that both signals are excited from a common resonator. The alternating of monotonic and harmonic respectively over this period is qualitatively similar with Julian’s synthetic time series about the nonlinear oscillator model. It is suggested that Raung Volcano magma pressure is sizeable to make a chaotic vibration. A pressure increasing in Raung magmatic conduit causes the increasing of P-wave velocity and makes a positive gliding frequency.


Keywords


MESA; harmonic; monotonic; nonlinear oscillator model; chaotic vibration

References


Bertin, D., Lara, L. E., Basualto, D., Amigo, Á., Cardona, C., Franco, L., Gil, F., and Lazo, J., 2015. High effusion rates of the Cordón Caulle 2011-2012 eruption (Southern Andes) and their relation with the quasi-harmonic tremor. Geophysical Research Letter, 42 (17), p.7054-7063. DOI:10.1002/2015GL064624

Havskov, J. and Alguacil, G., 2010. Instrumentation in earthquake seismology. Springer, Dordrecht, Netherland, p.167-171. DOI:10.1007/978-3-319-21314-9

Hotovec, A.J., Prejean, S.G., Vidale, J.E., and Gomberg, J., 2013. Strongly gliding harmonic tremor during the 2009 eruption of Redoubt Volcano. Journal of Volcanology and Geothermal Research, 259, p.89-99. DOI: 10.1016/j.jvolgeores.2012.01.001

James, M.R., Lane, S.J., and Houghton, B.F., 2012. Unsteady explosive activity: strombolian eruption. In: Fagents, S.A., Gregg, T., and Lopes, R. (eds), Modeling Volcanic Processes The Physics and Mathematics of Volcanism. Cambridge University Press, New York. p.110-111. DOI:10.1017/CBO9781139021562

Jousset, P., Neuberg, J., and Sturton, S., 2002. Modelling the time-dependent frequency content of low-frequency volcanic earthquakes. Journal of Volcanology and Geothermal Research,

, p.201-223. DOI:10.1016/S0377-0273(03)00255-5

Julian, B.R., 1994. Volcanic tremor: Nonlinear excitation by fluid flow. Journal Geophysics Research, 99, p.11859-11877. DOI:10.1029/93JB03129

Lees, J.M., Johnson, J.B., Ruiz, M., Troncoso, L., and Welsh, M., 2008. Reventador Volcano 2005: Eruptive activity inferred from seismoacoustic observation. Journal of Volcanology and Geothermal Research, 176, p.179-190. DOI:10.1016/j.jvolgeores.2007.10.006

Lessage, P., Mora, M.M., Alvarado, G.E., Pacheco, J., and Métaxian, J.P., 2006. Complex behaviour and source model of the tremor at Arenal Volcano, Costa Rica. Journal of Volcanology and Geothermal Research, 157, p.49-59. DOI:10.1016/j.jvolgeores.2006.03.047

PVMBG, 2011. Data Dasar GunungApi Indonesia (Edisi Kedua), Kementerian Energi dan Sumber Daya Mineral, Bandung (In Indonesian).

Sturton, S. and Neuberg, J., 2003. The effects of a decompression on seismic parameter profiles in a gas-charged magma. Journal of Volcanology and Geothermal Research, 128, p.18-199. DOI:10.1016/S0377-0273(03)00254-3

Wildani, A., Maryanto, S., Gunawan, H., Triastuty, H., and Hedrasto, M., 2013.Analisis non- linier tremor vulkanik Gunung Api Raung, Jawa Timur -Indonesia. Jurnal Neutrino, 6 (1) (In Indonesian). DOI: 10.18860/neu.v0i0.2442

Wu, N.,1997. The Maximum Entropy Method, (translated by T. S. Huang), Springer- Verlag, Berlin, Heidelberg. p.11-32. DOI: 10.1007/978-3-642-60629-8_2


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