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

Donaldson, Clare and Winder, Tom and Caudron, Corentin and White, Robert S. (2019) Crustal seismic velocity responds to a magmatic intrusion and seasonal loading in Iceland's Northern Volcanic Zone. Science Advances, 5 (11). ISSN 2375-2548 DOI https://doi.org/10.1126/sciadv.aax6642

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	2019AREP, IA75
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics 12 - PhD 07 - Gold Open Access
Journal or Publication Title:	Science Advances
Volume:	5
Identification Number:	https://doi.org/10.1126/sciadv.aax6642
Depositing User:	Sarah Humbert
Date Deposited:	30 Jul 2019 09:43
Last Modified:	12 Dec 2019 18:09
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4513

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