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A utilização de infrassons na monitorização sismovulcânica. Estado da arte no arquipélago dos Açores
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Abstract(s)
RESUMO: As primeiras referências a registos de infrassons associados a atividade vulcânica explosiva, remontam à erupção do vulcão Krakatoa em 1883. Os trabalhos pioneiros de investigação em infrassons foram desenvolvidos nas décadas de 60 a 80 do século XX. No entanto, foi com a assinatura do Tratado de Proibição Total de Ensaios Nucleares (CTBT) que os estudos em infrassons se começaram a destacar. A instalação da estação de infrassons IS42 na ilha Graciosa, no âmbito do regime de verificação do CTBT, permitiu ao IVAR iniciar a aplicação desta técnica de investigação com vista à sua integração nas suas redes de monitorização. Várias deteções de atividades eruptivas explosivas remotas (a milhares de quilómetros de distância) pela estação IS42 têm evidenciado bons resultados. Por outro lado, a monitorização da crise sismovulcânica de 2022 na ilha de São Jorge, com a instalação do array portátil de infrassons SJ1 em conjunto com a estação IS42, permitiu-nos integrar os seus resultados nos esforços de monitorização do IVAR e do CIVISA.
ABSTRACT: The first references to infrasound records associated with explosive volcanic activity date back to the 1883 Krakatoa volcano eruption. Pioneer research works on infrasound associated with important volcanic eruptions were developed in the 60s to 80s of the 20th Century. However, it was with the signing of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) that infrasound studies have experienced a major development. The installation of the IS42 infrasound station on Graciosa Island, under the CTBT verification regime, allowed IVAR to start applying this research technique towards its integration in its monitoring networks. The detection of remote explosive eruptive activity (thousands of kilometres away) by IS42 station gave us good results. Moreover, the monitoring of the 2022 seismovolcanic crisis on São Jorge Island, with the installation of the SJ1 infrasound mobile array in conjunction with the IS42 station, has allowed us to integrate its results in the IVAR and CIVISA monitoring efforts.
ABSTRACT: The first references to infrasound records associated with explosive volcanic activity date back to the 1883 Krakatoa volcano eruption. Pioneer research works on infrasound associated with important volcanic eruptions were developed in the 60s to 80s of the 20th Century. However, it was with the signing of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) that infrasound studies have experienced a major development. The installation of the IS42 infrasound station on Graciosa Island, under the CTBT verification regime, allowed IVAR to start applying this research technique towards its integration in its monitoring networks. The detection of remote explosive eruptive activity (thousands of kilometres away) by IS42 station gave us good results. Moreover, the monitoring of the 2022 seismovolcanic crisis on São Jorge Island, with the installation of the SJ1 infrasound mobile array in conjunction with the IS42 station, has allowed us to integrate its results in the IVAR and CIVISA monitoring efforts.
Description
Keywords
Monitorização sismovulcânica Infrassons Açores São Jorge Seismovolcanic monitoring Infrasound Azores
Citation
Wallenstein, N., Matos, S., Jesus, M.C. & Montalvo, A. (2025). A utilização de infrassons na monitorização sismovulcânica. Estado da arte no arquipélago dos Açores. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 411-415. https://doi.org/10.34637/6jrj-t447
Publisher
LNEG - Laboratório Nacional de Energia e Geologia