Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model
Volcanic activity excites low frequency acoustic waves, termed infrasound, in the atmosphere. Infrasound observations can be used to provide constraints on eruption properties, such as crater geometry and volume flux. At open-vent volcanoes, such as Erebus (Antarctica) and Villarrica (Chile), the in...
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ftboisestateu:oai:scholarworks.boisestate.edu:cgiss_facpubs-1240 2023-10-29T02:32:34+01:00 Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model Watson, Leighton M. Dunham, Eric M. Johnson, Jeffrey B. 2019-08-15T07:00:00Z https://scholarworks.boisestate.edu/cgiss_facpubs/241 https://doi.org/10.1016/j.jvolgeores.2019.05.007 unknown ScholarWorks https://scholarworks.boisestate.edu/cgiss_facpubs/241 http://dx.doi.org/10.1016/j.jvolgeores.2019.05.007 CGISS Publications and Presentations volcano infrasound resonance acoustic resonance infrasound modeling Geosciences Earth Sciences Geophysics and Seismology text 2019 ftboisestateu https://doi.org/10.1016/j.jvolgeores.2019.05.007 2023-09-29T15:03:46Z Volcanic activity excites low frequency acoustic waves, termed infrasound, in the atmosphere. Infrasound observations can be used to provide constraints on eruption properties, such as crater geometry and volume flux. At open-vent volcanoes, such as Erebus (Antarctica) and Villarrica (Chile), the infrasound signal is modulated by the crater properties. Eruptive activity at the bottom of the crater, such as unsteady degassing or explosions, can excite the air mass within the crater into resonance leading to infrasound generation with signals possessing clear spectral peaks, termed harmonics. Therefore, the effect of the crater on the infrasound signal, or crater acoustic response, must be accounted for when inverting harmonic infrasound observations for eruption properties at open-vent volcanoes. Here we develop a linearized model of quasione-dimensional (1D) wave propagation inside volcanic crater coupled with 3D axisymmetric radiation into the atmosphere from the crater, with waves generated by a volumetric flow rate source at the bottom of the crater. We perform simulations for a range of volcanic crater geometries, temperature profiles, gas compositions, and source descriptions to explore the influence of these properties on the infrasound signal. The observed infrasound signal depends on the flow rate source-time function, but interference of up- and down-going waves within the crater selectively amplifies the signal at the resonant frequencies of the crater. The crater resonance model presented here is verified by comparison with an established threedimensional (3D) infrasound code and is shown to be appropriate for realistic crater geometries when the crater radius is less than approximately one quarter of the acoustic wavelength. The model presented here is more computationally efficient and can be used to invert infrasound observations for a range of properties, such as crater geometry or volumetric flow rate associated with eruptions. We demonstrate the utility of our efficient modeling framework by ... Text Antarc* Antarctica Boise State University: Scholar Works Journal of Volcanology and Geothermal Research 380 64 79 |
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Open Polar |
collection |
Boise State University: Scholar Works |
op_collection_id |
ftboisestateu |
language |
unknown |
topic |
volcano infrasound resonance acoustic resonance infrasound modeling Geosciences Earth Sciences Geophysics and Seismology |
spellingShingle |
volcano infrasound resonance acoustic resonance infrasound modeling Geosciences Earth Sciences Geophysics and Seismology Watson, Leighton M. Dunham, Eric M. Johnson, Jeffrey B. Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model |
topic_facet |
volcano infrasound resonance acoustic resonance infrasound modeling Geosciences Earth Sciences Geophysics and Seismology |
description |
Volcanic activity excites low frequency acoustic waves, termed infrasound, in the atmosphere. Infrasound observations can be used to provide constraints on eruption properties, such as crater geometry and volume flux. At open-vent volcanoes, such as Erebus (Antarctica) and Villarrica (Chile), the infrasound signal is modulated by the crater properties. Eruptive activity at the bottom of the crater, such as unsteady degassing or explosions, can excite the air mass within the crater into resonance leading to infrasound generation with signals possessing clear spectral peaks, termed harmonics. Therefore, the effect of the crater on the infrasound signal, or crater acoustic response, must be accounted for when inverting harmonic infrasound observations for eruption properties at open-vent volcanoes. Here we develop a linearized model of quasione-dimensional (1D) wave propagation inside volcanic crater coupled with 3D axisymmetric radiation into the atmosphere from the crater, with waves generated by a volumetric flow rate source at the bottom of the crater. We perform simulations for a range of volcanic crater geometries, temperature profiles, gas compositions, and source descriptions to explore the influence of these properties on the infrasound signal. The observed infrasound signal depends on the flow rate source-time function, but interference of up- and down-going waves within the crater selectively amplifies the signal at the resonant frequencies of the crater. The crater resonance model presented here is verified by comparison with an established threedimensional (3D) infrasound code and is shown to be appropriate for realistic crater geometries when the crater radius is less than approximately one quarter of the acoustic wavelength. The model presented here is more computationally efficient and can be used to invert infrasound observations for a range of properties, such as crater geometry or volumetric flow rate associated with eruptions. We demonstrate the utility of our efficient modeling framework by ... |
format |
Text |
author |
Watson, Leighton M. Dunham, Eric M. Johnson, Jeffrey B. |
author_facet |
Watson, Leighton M. Dunham, Eric M. Johnson, Jeffrey B. |
author_sort |
Watson, Leighton M. |
title |
Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model |
title_short |
Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model |
title_full |
Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model |
title_fullStr |
Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model |
title_full_unstemmed |
Simulation and Inversion of Harmonic Infrasound From Open-Vent Volcanoes Using an Efficient Quasi-1D Crater Model |
title_sort |
simulation and inversion of harmonic infrasound from open-vent volcanoes using an efficient quasi-1d crater model |
publisher |
ScholarWorks |
publishDate |
2019 |
url |
https://scholarworks.boisestate.edu/cgiss_facpubs/241 https://doi.org/10.1016/j.jvolgeores.2019.05.007 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
CGISS Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/cgiss_facpubs/241 http://dx.doi.org/10.1016/j.jvolgeores.2019.05.007 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2019.05.007 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
380 |
container_start_page |
64 |
op_container_end_page |
79 |
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1781054213482086400 |