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Authors: Taddeucci, J.*
Sesterhenn, J.*
Scarlato, P.*
Stampka, K.*
Del Bello, E.*
Pena Fernandez, J. J.*
Title: High-speed imaging, acoustic features, and aeroacoustic computations of jet noise from Strombolian (and Vulcanian) explosions
Title of journal: Geophysical Research Letters
Series/Report no.: /41 (2014)
Publisher: American Geophysical Union
Issue Date: 16-May-2014
DOI: 10.1002/2014GL059925
Keywords: jet noise
volcano acoustics
strombolian eruption
Abstract: High-speed imaging of explosive eruptions at Stromboli (Italy), Fuego (Guatemala), and Yasur (Vanuatu) volcanoes allowed visualization of pressure waves from seconds-long explosions. From the explosion jets, waves radiate with variable geometry, timing, and apparent direction and velocity. Both the explosion jets and their wave fields are replicated well by numerical simulations of supersonic jets impulsively released from a pressurized vessel. The scaled acoustic signal from one explosion at Stromboli displays a frequency pattern with an excellent match to those from the simulated jets. We conclude that both the observed waves and the audible sound from the explosions are jet noise, i.e., the typical acoustic field radiating from high-velocity jets. Volcanic jet noise was previously quantified only in the infrasonic emissions from large, sub-Plinian to Plinian eruptions. Our combined approach allows us to define the spatial and temporal evolution of audible jet noise from supersonic jets in small-scale volcanic eruptions.
Appears in Collections:04.08.99. General or miscellaneous
04.08.07. Instruments and techniques
05.02.03. Volcanic eruptions
04.08.06. Volcano monitoring
Papers Published / Papers in press

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