PT  - JOURNAL ARTICLE
AU  - Donaldson, C.
AU  - Winder, T.
AU  - Caudron, C.
AU  - White, R. S.
TI  - Crustal seismic velocity responds to a magmatic intrusion and seasonal loading in Iceland’s Northern Volcanic Zone
AID  - 10.1126/sciadv.aax6642
DP  - 2019 Nov 01
TA  - Science Advances
PG  - eaax6642
VI  - 5
IP  - 11
4099  - http://advances.sciencemag.org/content/5/11/eaax6642.short
4100  - http://advances.sciencemag.org/content/5/11/eaax6642.full
SO  - Sci Adv2019 Nov 01; 5
AB  - 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.