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Title: Utilizing the solution of sound diffraction by a thin screen to evaluate infrasound waves attenuated around volcano topography
Authors: Ishii, Kyoka
Yokoo, Akihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-4671-3546 (unconfirmed)
Iguchi, Masato  kyouindb  KAKEN_id
Fujita, Eisuke
Author's alias: 石井, 杏佳
横尾, 亮彦
井口, 正人
Keywords: Infrasound
Diffraction
Signal attenuation
Volcano topography
Issue Date: 15-Sep-2020
Publisher: Elsevier BV
Journal title: Journal of Volcanology and Geothermal Research
Volume: 402
Thesis number: 106983
Abstract: The observation of infrasound signals in the vicinity of volcanoes is a powerful tool to understand the source of explosive volcanic activity. Although the propagation of infrasound signals is affected by the local topography, such effects are often ignored in the analysis, leading to potential misinterpretation of the source parameters. In this study, we propose a simple low-cost method of evaluating the attenuation of infrasound signals by topographical barriers. In this method, the first step approximates the elevation profile between the source and station into one thin screen-like barrier. Then, a mathematically exact solution of a sound diffraction problem is adopted to evaluate the attenuation of the infrasound amplitudes. To assess the validity of this method, the obtained estimates are compared with actual infrasound data observed at Sakurajima volcano, Japan. The results show that the estimates of relative amplitude to a reference station are more accurate than those considering only geometrical spreading, suggesting that the proposed method provides a useful first-order investigation of the attenuation of infrasound signals. The spatial distribution of the attenuation in the entire area of the volcano was also estimated, revealing a significant contrast between the eastern and western sides of the study area. Variations in signal attenuation also depend on the radial distance from the crater and were mainly attributed to variations of the relative screen height to the incident wavelength.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The full-text file will be made open to the public on 15 September 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/252937
DOI(Published Version): 10.1016/j.jvolgeores.2020.106983
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