The dynamics of a long-lasting effusive eruption modulated by Earth tides

International audience Deciphering eruptive dynamics in near-real time is essential when dealing with hazard assessment and population evacuation. Recognition of specific patterns in time-series measured during volcanic activity may help decipher distinctive behavior at active volcanoes, providing i...

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Bibliographic Details
Published in:Earth and Planetary Science Letters
Main Authors: Dumont, Stéphanie, Le Mouël, Jean-Louis, Courtillot, Vincent, Lopes, Fernando, Sigmundsson, Freysteinn, Coppola, Diego, Eibl, Eva P. S., Bean, Christopher J.
Other Authors: Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2020
Subjects:
thermal anomalies
Holuhraun
Earth tides
effusive eruption
seismic tremor
lava flows
[SDU]Sciences of the Universe [physics]
Iceland
Online Access:https://hal-insu.archives-ouvertes.fr/insu-03584799
https://doi.org/10.1016/j.epsl.2020.116145
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Summary:International audience Deciphering eruptive dynamics in near-real time is essential when dealing with hazard assessment and population evacuation. Recognition of specific patterns in time-series measured during volcanic activity may help decipher distinctive behavior at active volcanoes, providing insights into the underlying driving mechanisms. Multi-parameter data sets usually agree on the overall trend characterizing the temporal evolution of an eruption providing insights into the first-order eruptive dynamics. However, second-order variations detected in different data sets remain often poorly understood. The 2014-2015 Holuhraun eruption (Iceland) offers an excellent opportunity to investigate the dynamics of a long-lasting effusive eruption. We analyze the seismic tremor and the volcanic radiated power emitted by the lava field during the 6 months of the eruption using Singular Spectrum Analysis (SSA). In both geophysical time-series, we identify periods from ∼5 to ∼32 days coinciding with periods of Earth tides. Here we show that ∼50% of both signals are composed of tidal periods suggesting that magma movements follow frequencies imposed by lunisolar forces within the crust and at Earth's surface.

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