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Crustal seismic velocity responds to a magmatic intrusion and seasonal loading in Iceland’s Northern Volcanic Zone

par Donaldson, Clare;Winder, T.;Caudron, Corentin ;White, Robert S.
Référence Science advances, 5, 11, page (eaax6642)
Publication Publié, 2019-11

Article révisé par les pairs

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Résumé :

Seismic noise interferometry is an exciting technique for studying volcanoes, providing a continuous measurement of seismic velocity changes ( dv / v ), which are sensitive to magmatic processes that affect the surrounding crust. However, understanding the exact mechanisms causing changes in dv / v is often difficult. We present dv / v measurements over 10 years in central Iceland, measured using single-station cross-component correlation functions from 51 instruments across a range of frequency bands. We observe a linear correlation between changes in dv / v and volumetric strain at stations in regions of both compression and dilatation associated with the 2014 Bárðarbunga-Holuhraun dike intrusion. Furthermore, a clear seasonal cycle in dv / v is modeled as resulting from elastic and poroelastic responses to changing snow thickness, atmospheric pressure, and groundwater level. This study comprehensively explains variations in dv / v arising from diverse crustal stresses and highlights the importance of deformation modeling when interpreting dv / v , with implications for volcano and environmental monitoring worldwide.