Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress

Abstract Space-geodetic observations of a new period of inflation at Mauna Loa volcano, Hawaii, recorded an influx of 0.11 km3 of new magma into it’s dike-like magma body during 2014–2020. The intrusion started after at least 4 years of decollement slip under the eastern flank creating > 0.15 MPa...

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Autores principales:	Bhuvan Varugu, Falk Amelung
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c90cb350f1b7483cbca001cf340dfc55
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spelling	oai:doaj.org-article:c90cb350f1b7483cbca001cf340dfc552021-12-02T14:35:34ZSouthward growth of Mauna Loa’s dike-like magma body driven by topographic stress10.1038/s41598-021-89203-62045-2322https://doaj.org/article/c90cb350f1b7483cbca001cf340dfc552021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89203-6https://doaj.org/toc/2045-2322Abstract Space-geodetic observations of a new period of inflation at Mauna Loa volcano, Hawaii, recorded an influx of 0.11 km3 of new magma into it’s dike-like magma body during 2014–2020. The intrusion started after at least 4 years of decollement slip under the eastern flank creating > 0.15 MPa opening stresses in the rift zone favorable for magma intrusion. Volcanoes commonly respond to magma pressure increase with the injection of a dike, but Mauna Loa responded with lateral growth of its magma body in the direction of decreasing topographic stress. In 2017, deformation migrated back, and inflation continued at the pre-2015 location. Geodetic inversions reveal a 8 × 8.5, 10 × 3 and 9 × 4 km2 dike-like magma body during the 2014–2015, 2015–2018 and 2018–2020 periods, respectively, and an average decollement slip of ~ 23 cm/year along a 10 × 5 km2 fault. The evolution of the dike-like magma body including the reduction in vertical extent is consistent with a slowly ascending dike propagating laterally when encountering a stress barrier and freezing its tip when magma influx waned. Overall, the magma body widened about 4.5 m during 2002–2020.Bhuvan VaruguFalk AmelungNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bhuvan Varugu Falk Amelung Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress
description	Abstract Space-geodetic observations of a new period of inflation at Mauna Loa volcano, Hawaii, recorded an influx of 0.11 km3 of new magma into it’s dike-like magma body during 2014–2020. The intrusion started after at least 4 years of decollement slip under the eastern flank creating > 0.15 MPa opening stresses in the rift zone favorable for magma intrusion. Volcanoes commonly respond to magma pressure increase with the injection of a dike, but Mauna Loa responded with lateral growth of its magma body in the direction of decreasing topographic stress. In 2017, deformation migrated back, and inflation continued at the pre-2015 location. Geodetic inversions reveal a 8 × 8.5, 10 × 3 and 9 × 4 km2 dike-like magma body during the 2014–2015, 2015–2018 and 2018–2020 periods, respectively, and an average decollement slip of ~ 23 cm/year along a 10 × 5 km2 fault. The evolution of the dike-like magma body including the reduction in vertical extent is consistent with a slowly ascending dike propagating laterally when encountering a stress barrier and freezing its tip when magma influx waned. Overall, the magma body widened about 4.5 m during 2002–2020.
format	article
author	Bhuvan Varugu Falk Amelung
author_facet	Bhuvan Varugu Falk Amelung
author_sort	Bhuvan Varugu
title	Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress
title_short	Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress
title_full	Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress
title_fullStr	Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress
title_full_unstemmed	Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress
title_sort	southward growth of mauna loa’s dike-like magma body driven by topographic stress
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c90cb350f1b7483cbca001cf340dfc55
work_keys_str_mv	AT bhuvanvarugu southwardgrowthofmaunaloasdikelikemagmabodydrivenbytopographicstress AT falkamelung southwardgrowthofmaunaloasdikelikemagmabodydrivenbytopographicstress
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Southward growth of Mauna Loa’s dike-like magma body driven by topographic stress

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