Publication Date:
2019
Description:
〈p〉Seismic noise interferometry is an exciting technique for studying volcanoes, providing a continuous measurement of seismic velocity changes (〈i〉dv〈/i〉/〈i〉v〈/i〉), which are sensitive to magmatic processes that affect the surrounding crust. However, understanding the exact mechanisms causing changes in 〈i〉dv〈/i〉/〈i〉v〈/i〉 is often difficult. We present 〈i〉dv〈/i〉/〈i〉v〈/i〉 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 〈i〉dv〈/i〉/〈i〉v〈/i〉 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 〈i〉dv〈/i〉/〈i〉v〈/i〉 is modeled as resulting from elastic and poroelastic responses to changing snow thickness, atmospheric pressure, and groundwater level. This study comprehensively explains variations in 〈i〉dv〈/i〉/〈i〉v〈/i〉 arising from diverse crustal stresses and highlights the importance of deformation modeling when interpreting 〈i〉dv〈/i〉/〈i〉v〈/i〉, with implications for volcano and environmental monitoring worldwide.〈/p〉
Electronic ISSN:
2375-2548
Topics:
Natural Sciences in General
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