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Joint Analysis of Infrasound and Seismic Signals by Cross Wavelet Transform: Detection of Mt. Etna Explosive Activity : Volume 13, Issue 6 (26/06/2013)

By Cannata, A.

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Book Id: WPLBN0004018161
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Joint Analysis of Infrasound and Seismic Signals by Cross Wavelet Transform: Detection of Mt. Etna Explosive Activity : Volume 13, Issue 6 (26/06/2013)  
Author: Cannata, A.
Volume: Vol. 13, Issue 6
Language: English
Subject: Science, Natural, Hazards
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Patanè, D., Cannata, A., & Montalto, P. (2013). Joint Analysis of Infrasound and Seismic Signals by Cross Wavelet Transform: Detection of Mt. Etna Explosive Activity : Volume 13, Issue 6 (26/06/2013). Retrieved from http://worldlibrary.net/


Description
Description: Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo – Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy. The prompt detection of explosive volcanic activity is crucial since this kind of activity can release copious amounts of volcanic ash and gases into the atmosphere, causing severe dangers to aviation. In this work, we show how the joint analysis of seismic and infrasonic data by wavelet transform coherence (WTC) can be useful to detect explosive activity, significantly enhancing its recognition that is normally done by video cameras and thermal sensors. Indeed, the efficiency of these sensors can be reduced (or inhibited) in the case of poor visibility due to clouds or gas plumes. In particular, we calculated the root mean square (RMS) of seismic and infrasonic signals recorded at Mt. Etna during 2011. This interval was characterised by several episodes of lava fountains, accompanied by lava effusion, and minor strombolian activities. WTC analysis showed significantly high values of coherence between seismic and infrasonic RMS during explosive activity, with infrasonic and seismic series in phase with each other, hence proving to be sensitive to both weak and strong explosive activity. The WTC capability of automatically detecting explosive activity was compared with the potential of detection methods based on fixed thresholds of seismic and infrasonic RMS. Finally, we also calculated the cross correlation function between seismic and infrasonic signals, which showed that the wave types causing such seismo-acoustic relationship are mainly incident seismic and infrasonic waves, likely with a common source.

Summary
Joint analysis of infrasound and seismic signals by cross wavelet transform: detection of Mt. Etna explosive activity

Excerpt
Alparone, S., Andronico, D., Sgroi, T., Ferrari, F., Lodato, L., and Reitano, D.: Alert system to mitigate tephra fallout hazards at Mt. Etna Volcano, Italy, Nat. Hazards 43, 333–350, 2007a.; Alparone, S., Cannata, A., and Gresta, S.: Time variation of spectral and wavefield features of volcanic tremor at Mt. Etna (January–June 1999), J. Volcanol. Geoth. Res., 161, 318–332, 2007b.; Andronico, D. and Lodato, L.: Effusive activity at Mount Etna volcano (Italy) during the 20th century: a contribution to volcanic hazard assessment, Nat. Hazards, 36, 407–443, 2005.; Andronico, D., Lo Castro, M. D., Sciotto, M., and Spina, L.: The 2010 ash emissions at the summit craters of Mt Etna: Relationship with seismo-acoustic signals, J. Geophys. Res., doi:10.1029/2012JB009895, in press, 2013.; Arrowsmith, S., Johnson, J., Drob, D., and Hedlin, M.: The Seismo-Acoustic Wavefield: A new paradigm in studying geophysical phenomena, Rev. Geophys., 48, RG4003, doi:10.1029/2010RG000335, 2010.; Barruol, G., Reymond, D., Fontaine, F. R., Hyvernaud, O., Maurer, V., and Maa-maatuaiahutapu, K.: Characterizing swells in the southern Pacific from seismic and infrasonic noise analyses, Geophys. J. Int., 164, 516–542, 2006.; Behncke, B.: Hazards from pyroclastic density currents at Mt. Etna (Italy), J. Volcanol. Geoth. Res., 180, 148–160, 2009.; Cannata, A., Catania, A., Alparone, S., and Gresta, S.: Volcanic tremor at Mt. Etna: inferences on magma dynamics during effusive and explosive activity, J. Volcanol. Geoth. Res., 178, 19–31, 2008.; Cannata, A., Montalto, P., Privitera, E., Russo, G., and Gresta, S.: Tracking eruptive phenomena by infrasound: May 13, 2008 eruption at Mt. Etna, Geophys. Res. Lett., 36, L05304, doi:10.1029/2008GL036738, 2009.; Cannata, A., Giudice, G., Gurrieri, S., Montalto, P., Alparone, S., Di Grazia, G., Favara, R., and Gresta, S.: Relationship between soil CO2 flux and volcanic tremor at Mt. Etna: implications for magma dynamics, Environ. Earth Sci., 61, 477–489, doi:10.1007/s12665-009-0359-z, 2010a.; Cannata, A., Di Grazia, G., Montalto, P., Ferrari, F., Nunnari, G., Patanè, D., and Privitera, E.: New insights into banded tremor from the 2008–2009 Mt. Etna eruption, J. Geophys. Res., 115, B12318, doi:10.1029/2009JB007120, 2010b.; Cannata, A., Sciotto, M., Spampinato, L., and Spina, L.: Insights into explosive activity at eruptive fissure closely-spaced vents by infrasound signals: example of Mt. Etna 2008 eruption, J. Volcanol. Geotherm. Res., 208, 1–11, 2011.; Cassisi, C., Aliotta, M., Cannata, A., Montalto, P., Patanè, D., Pulvirenti, A., and Spampinato, L.: Motif Discovery on Seismic Amplitude Time Series: The Case Study of Mt Etna 2011 Eruptive Activity, Pure Appl. Geophys., doi:10.1007/s00024-012-0560-y, online first, 2012.; Chilo, J., Jabor, A., Liszka, L., Eide, A. J., Lindblad, T., and Persson, L.: Infrasonic and Seismic Signals from Earthquake and Explosions in Arequipa, Perú, Western Pacific Geophysics Meeting, 24–27 July 2006, KTH, Physics, Beijing China, QC 20101110, 2006.; Dalton, M. P., Waite, G. P., Watson, I. M., and Nadeau, P. A.: Multiparameter quantification of gas release during weak Strombolian eruptions at Pacaya Volcano, Guatemala, Geophys. Res. Lett., 37, L09303, doi:10.1029/2010GL042617, 2010.; Daubechies, I.: The wavelet transform time-frequency localization and signal analysis, IEEE Trans. Inform. Theory, 36, 961–1004, 1990.; Donner, R. and Thiel, M.: Scale-resolved phase coherence analysis of hemispheric sunspot activity: a new look at the north-south asymmet

 

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