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High‐speed imaging, acoustic features, and aeroacoustic computations of jet noise from Strombolian (and Vulcanian) explosions
Author(s) -
Taddeucci J.,
Sesterhenn J.,
Scarlato P.,
Stampka K.,
Del Bello E.,
Pena Fernandez J. J.,
Gaudin D.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl059925
Subject(s) - strombolian eruption , geology , seismology , jet (fluid) , explosive eruption , supersonic speed , volcano , noise (video) , jet noise , acoustics , infrasound , physics , geophysics , pyroclastic rock , mechanics , artificial intelligence , computer science , image (mathematics)
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.