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Your search keyword '"Fuensanta G. Montesinos"' showing total 2 results
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2 results on '"Fuensanta G. Montesinos"'

1. Insights into the Magmatic Feeding System of the 2021 Eruption at Cumbre Vieja (La Palma, Canary Islands) Inferred from Gravity Data Modeling

Author

Fuensanta G. Montesinos, Sergio Sainz-Maza, David Gómez-Ortiz, José Arnoso, Isabel Blanco-Montenegro, Maite Benavent, Emilio Vélez, Nieves Sánchez, and Tomás Martín-Crespo

Subjects
volcano plumbing systems, geophysical methods, four-dimensional gravimetry, inverse and forward model, La Palma 2021 eruption, Science
Abstract

This study used spatiotemporal land gravity data to investigate the 2021 eruption that occurred in the Cumbre Vieja volcano (La Palma, Canary Islands). First, we produced a density model by inverting the local gravity field using data collected in July 2005 and July 2021. This model revealed a low-density body beneath the western flank of the volcano that explains a highly fractured and altered structure related to the active hydrothermal system. Then, we retrieved changes in gravity and GNSS vertical displacements from repeated measurements made in a local network before (July 2021) and after (January 2022) the eruption. After correcting the vertical surface displacements, the gravity changes produced by mass variation during the eruptive process were used to build a forward model of the magmatic feeding system consisting of dikes and sills based on an initial model defined by the paths of the earthquake hypocenters preceding the eruption. Our study provides a final model of the magma plumbing system, which establishes a spatiotemporal framework tracing the path of magma ascent from the crust–mantle boundary to the surface from 11–19 September 2021, where the shallowest magma path was strongly influenced by the low-density body identified in the inversion process.

Published
2023
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2. 2D strain rate and ground deformation modelling from continuous and survey mode GNSS data in El Hierro, Canary Islands

Author

José Arnoso, Umberto Riccardi, Umberto Tammaro, Maite Benavent, Fuensanta G. Montesinos, Emilio Vélez, L. García-Asenjo, J. Luis Lerma, Arnoso, J., Riccardi, U., Tammaro, U., Benavent, M., Montesinos, F. G., and Vélez, E.

Subjects
Kinematics and ground deformation, Global Navigation Satellite system (GNSS), Canary Islands, GNSS, kinematics, ground deformation, strain, Canary Islands
Abstract

[EN] We present a study of the deformation pattern in El Hierro Island through the analysis of GNSS data from surveys carried out between 2015 and 2019 as well as continuous data. The last eruption in El Hierro occurred under the sea on the south rift, lasted from October 2011 to March 2012, and it was preceded by intense seismic activity and nearly 5 cm ground inflation. After this eruptive cycle, further magmatic intrusions were detected, from June 2012 to March 2014, associated to intense seismic swarms and inflation (about 22 cm of uplift). Nevertheless, these magmatic intrusions did not culminate in any eruption. Following these post-eruptive episodes, the seismic activity became less intense. Thus, for the period of this study, about 500 earthquakes with magnitude ranging from mbLG 2 to mbLG 3.9 were recorded, the ground deformation measured is of lower magnitude, still remaining a slight uplift trend in the GNSS stations up to 2017 and followed by a slight subsidence of about 1.5 cm between 2017-2019. Our purpose is to explain the ground displacements measured and the earthquake occurrence in terms of geodynamics and seismotectonic activity along the island, for the period 2015-2019. Firstly, we retrieved the geodetic velocities from the GNSS daily solutions. Secondly, we computed the 2D infinitesimal strain rates from the velocities through a triangular segmentation approach to map the deformation pattern along the respective GNSS surveys., Projects PID2019-104726GB-I00 and CGL2015- 63799-P of the Spanish Research Agency has supported this research. We wish to acknowledge GRAFCAN (www.grafcan.es) of the Government of the Canary Islands for providing GNSS data from permanent station FRON. Likewise, to the Spanish IGN (www.ign.es) for providing the EH01 and LRES data.

Published
2022

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