Magma pressure discharge induces very long period seismicity

Abstract Volcano seismicity is one of the key parameters to understand magma dynamics of erupting volcanoes. However, the physical process at the origin of the resulting complex and broadband seismic signals remains unclear. Syn-eruptive very long period (VLP) seismic signals have been explained in...

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Autores principales:	M. Ripepe, D. Delle Donne, D. Legrand, S. Valade, G. Lacanna
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0f7b5c86fe984aa2ac8c79680ab850de
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spelling	oai:doaj.org-article:0f7b5c86fe984aa2ac8c79680ab850de2021-12-02T18:37:08ZMagma pressure discharge induces very long period seismicity10.1038/s41598-021-99513-42045-2322https://doaj.org/article/0f7b5c86fe984aa2ac8c79680ab850de2021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-99513-4https://doaj.org/toc/2045-2322Abstract Volcano seismicity is one of the key parameters to understand magma dynamics of erupting volcanoes. However, the physical process at the origin of the resulting complex and broadband seismic signals remains unclear. Syn-eruptive very long period (VLP) seismic signals have been explained in terms of the sudden expansion of gas pockets rising in the liquid melt. Their origin is linked to a magma dynamics which triggers the explosive process occurring before the explosive onset. We provide evidence based on acoustic, thermal, and ground deformation data to demonstrate that VLP signals at Stromboli are generated at the top of the magma column mainly after the explosion onset. We show that VLP amplitude and duration scale with the eruptive flux which induces a decompression of 103–104 Pa involving the uppermost ~ 250 m of the feeding conduit. The seismic VLP source represents the final stage of a ~ 200 s long charge and discharge mechanism the magma column has to release excess gas accumulated at the base of a denser and degassed magma mush. The position of the VLP seismic source coincides with the centroid of the shallow mush plug and tracks elevation changes of the magma free surface.M. RipepeD. Delle DonneD. LegrandS. ValadeG. LacannaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Ripepe D. Delle Donne D. Legrand S. Valade G. Lacanna Magma pressure discharge induces very long period seismicity
description	Abstract Volcano seismicity is one of the key parameters to understand magma dynamics of erupting volcanoes. However, the physical process at the origin of the resulting complex and broadband seismic signals remains unclear. Syn-eruptive very long period (VLP) seismic signals have been explained in terms of the sudden expansion of gas pockets rising in the liquid melt. Their origin is linked to a magma dynamics which triggers the explosive process occurring before the explosive onset. We provide evidence based on acoustic, thermal, and ground deformation data to demonstrate that VLP signals at Stromboli are generated at the top of the magma column mainly after the explosion onset. We show that VLP amplitude and duration scale with the eruptive flux which induces a decompression of 103–104 Pa involving the uppermost ~ 250 m of the feeding conduit. The seismic VLP source represents the final stage of a ~ 200 s long charge and discharge mechanism the magma column has to release excess gas accumulated at the base of a denser and degassed magma mush. The position of the VLP seismic source coincides with the centroid of the shallow mush plug and tracks elevation changes of the magma free surface.
format	article
author	M. Ripepe D. Delle Donne D. Legrand S. Valade G. Lacanna
author_facet	M. Ripepe D. Delle Donne D. Legrand S. Valade G. Lacanna
author_sort	M. Ripepe
title	Magma pressure discharge induces very long period seismicity
title_short	Magma pressure discharge induces very long period seismicity
title_full	Magma pressure discharge induces very long period seismicity
title_fullStr	Magma pressure discharge induces very long period seismicity
title_full_unstemmed	Magma pressure discharge induces very long period seismicity
title_sort	magma pressure discharge induces very long period seismicity
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0f7b5c86fe984aa2ac8c79680ab850de
work_keys_str_mv	AT mripepe magmapressuredischargeinducesverylongperiodseismicity AT ddelledonne magmapressuredischargeinducesverylongperiodseismicity AT dlegrand magmapressuredischargeinducesverylongperiodseismicity AT svalade magmapressuredischargeinducesverylongperiodseismicity AT glacanna magmapressuredischargeinducesverylongperiodseismicity
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Magma pressure discharge induces very long period seismicity

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