Magmatic connectivity among six Galápagos volcanoes revealed by satellite geodesy

Eoin Reddin (), Susanna K. Ebmeier (), Eleonora Rivalta, Marco Bagnardi, Scott Baker, Andrew F. Bell, Patricia Mothes and Santiago Aguaiza
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Eoin Reddin: University of Leeds
Susanna K. Ebmeier: University of Leeds
Eleonora Rivalta: University of Bologna
Marco Bagnardi: NASA Goddard Space Flight Center
Scott Baker: BOS Technologies LLC
Andrew F. Bell: University of Edinburgh
Patricia Mothes: Instituto Geofísico de la Escuela Politécnica Nacional
Santiago Aguaiza: Instituto Geofísico de la Escuela Politécnica Nacional

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Shallow magmatic reservoirs that produce measurable volcanic surface deformation are often considered as discrete independent systems. However, petrological analyses of erupted products suggest that these may be the shallowest expression of extensive, heterogeneous magmatic systems that we show may be interconnected. We analyse time series of satellite-radar-measured displacements at Western Galápagos volcanoes from 2017 to 2022 and revisit historical displacements. We demonstrate that these volcanoes consistently experience correlated displacements during periods of heightened magma supply to the shallow crust. We rule out changes in static stress, shallow hydraulic connections, and data processing and analysis artefacts. We propose that episodic surges of magma into interconnected magmatic systems affect neighbouring volcanoes, simultaneously causing correlations in volcanic uplift and subsidence. While expected to occur globally, such processes are uniquely observable at the dense cluster of Western Galápagos volcanoes, thanks to the high rate of surface displacements and the wealth of geodetic measurements.

Date: 2023
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DOI: 10.1038/s41467-023-42157-x

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