%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Donaldson, C.
%A Winder, T.
%A Caudron, Corentin
%A White, R. S.
%T Crustal seismic velocity responds to a magmatic intrusion and seasonal loading in Iceland's Northern Volcanic Zone
%D 2019
%L fdi:010077418
%G ENG
%J Science Advances
%@ 2375-2548
%K ISLANDE
%M ISI:000499736100055
%N 11
%P eaax6642 [13 ]
%R 10.1126/sciadv.aax6642
%U https://www.documentation.ird.fr/hor/fdi:010077418
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010077418.pdf
%V 5
%W Horizon (IRD)
%X 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 Baroarbunga-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.
%$ 066 ; 020