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. 2023 Jul 10;13:11115. doi: 10.1038/s41598-023-38205-7

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Comparison between the spectral content of the seismic precursor of the October 9 2022 episode (a) and a signal generated by an explosion (b). Panel (a) shows the seismogram and power spectral density of the seismic precursor onset. Panel (b) shows the seismogram and power spectral density of the explosion signal. Note the peak due to the VLP component. The filtered signal in the VLP band (0.05–0.5 Hz) is shown in red on the seismogram. Panel (c) shows the seismogram and power spectral density of the tremor recording.