BIBLIOS

Document type
Journal articles

Document subtype
Full paper

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

Participants in the publication
Stéphanie Dumont (Author)
UNIVERSIDADE DA BEIRA INTERIOR
IDL
Jean-Louis Le Mouël (Author)
Vincent Courtillot (Author)
Fernando Lopes (Author)
Freysteinn Sigmundsson (Author)
Diego Coppola (Author)
Eva P.S. Eibl (Author)
Christopher J. Bean (Author)

Summary
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\\\\neruption (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.


Institution
INSTITUTO GEOFÍSICO INFANTE DOM LUIZ

Where published
Earth and Planetary Science Letters

Publication Identifiers
ISSN - 0012-821X

Publisher
Elsevier BV



Document Identifiers
DOI - https://doi.org/10.1016/j.epsl.2020.116145
URL - http://dx.doi.org/10.1016/j.epsl.2020.116145

Keywords
Holuhraun eruption; Earth tides; effusive eruption; seismic tremor; lava flows; thermal anomalies;