Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring

Abstract Explosive volcanic eruptions are associated with a plethora of geophysical signals. Among them, acoustic signals provide ample information about eruptive dynamics and are widely used for monitoring purposes. However, a mechanistic correlation of monitoring signals, underlying source process...

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Autores principales:	J. J. Peña Fernández, V. Cigala, U. Kueppers, J. Sesterhenn
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5e6d704d9d8b40e39dc7a4433ed991f9
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spelling	oai:doaj.org-article:5e6d704d9d8b40e39dc7a4433ed991f92021-12-02T19:06:33ZAcoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring10.1038/s41598-020-69949-12045-2322https://doaj.org/article/5e6d704d9d8b40e39dc7a4433ed991f92020-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-69949-1https://doaj.org/toc/2045-2322Abstract Explosive volcanic eruptions are associated with a plethora of geophysical signals. Among them, acoustic signals provide ample information about eruptive dynamics and are widely used for monitoring purposes. However, a mechanistic correlation of monitoring signals, underlying source processes and reasons for short-term variations is incomplete. Scaled laboratory experiments can mimic a wide range of explosive volcanic eruption conditions. Here, starting (non-steady) compressible gas jets are created using a shock tube in an anechoic chamber and their acoustic signature is recorded with a microphone array. Noise sources are mapped in time and frequency using wavelet analysis and their dependence from pressure ratio, non-dimensional mass supply and exit-to-throat area ratio is deciphered. We observed that the pressure ratio controls the establishment of supersonic conditions and their duration, and influences the interaction between shock, shear layer, and vortex ring. The non-dimensional mass supply affects the duration of the discharge, the maximum velocity of the flow, and the existence of a trailing jet. Lower values of exit-to-throat area ratio induce a faster decay of the acoustic fingerprint of the jet flow. The simplistic experiments presented here, and their acoustic analysis will serve as an essential starting point to infer source conditions prior to and during impulsive volcanic eruptions.J. J. Peña FernándezV. CigalaU. KueppersJ. SesterhennNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. J. Peña Fernández V. Cigala U. Kueppers J. Sesterhenn Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
description	Abstract Explosive volcanic eruptions are associated with a plethora of geophysical signals. Among them, acoustic signals provide ample information about eruptive dynamics and are widely used for monitoring purposes. However, a mechanistic correlation of monitoring signals, underlying source processes and reasons for short-term variations is incomplete. Scaled laboratory experiments can mimic a wide range of explosive volcanic eruption conditions. Here, starting (non-steady) compressible gas jets are created using a shock tube in an anechoic chamber and their acoustic signature is recorded with a microphone array. Noise sources are mapped in time and frequency using wavelet analysis and their dependence from pressure ratio, non-dimensional mass supply and exit-to-throat area ratio is deciphered. We observed that the pressure ratio controls the establishment of supersonic conditions and their duration, and influences the interaction between shock, shear layer, and vortex ring. The non-dimensional mass supply affects the duration of the discharge, the maximum velocity of the flow, and the existence of a trailing jet. Lower values of exit-to-throat area ratio induce a faster decay of the acoustic fingerprint of the jet flow. The simplistic experiments presented here, and their acoustic analysis will serve as an essential starting point to infer source conditions prior to and during impulsive volcanic eruptions.
format	article
author	J. J. Peña Fernández V. Cigala U. Kueppers J. Sesterhenn
author_facet	J. J. Peña Fernández V. Cigala U. Kueppers J. Sesterhenn
author_sort	J. J. Peña Fernández
title	Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
title_short	Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
title_full	Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
title_fullStr	Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
title_full_unstemmed	Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
title_sort	acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/5e6d704d9d8b40e39dc7a4433ed991f9
work_keys_str_mv	AT jjpenafernandez acousticanalysisofstartingjetsinananechoicchamberimplicationsforvolcanomonitoring AT vcigala acousticanalysisofstartingjetsinananechoicchamberimplicationsforvolcanomonitoring AT ukueppers acousticanalysisofstartingjetsinananechoicchamberimplicationsforvolcanomonitoring AT jsesterhenn acousticanalysisofstartingjetsinananechoicchamberimplicationsforvolcanomonitoring
_version_	1718377151522144256

Acoustic analysis of starting jets in an anechoic chamber: implications for volcano monitoring

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