Imaging Torfajökull’s volcano with seismic interferometry and surface-wave tomography

Martins, J. C. and Ruigrok, E. and Draganov, D. and Hooper, A. and Hanssen, R. and White, R. S. and Soosalu, H. (2018) Imaging Torfajökull’s volcano with seismic interferometry and surface-wave tomography. Journal of Geophysical Research-Solid Earth. ISSN 0148-0227 DOI dooi: 10.1029/2018JB016002

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Torfajökull volcano, Iceland, has not erupted since 1477. However, intense geothermal activity, deformation, and seismicity suggest a long‐lasting magmatic system. In this paper, we use ambient noise tomography to image the magmatic system beneath Torfajökull volcano. One hundred days of ambient noise data from 23 broadband seismometers show the consistent presence of double‐frequency microseism noise with significant power between ∼0.1 and 0.5 Hz. Beamforming results indicate microseism noise with persistent higher energy propagating from west and SE directions and apparent velocities below 3 km/s. We use ambient noise seismic interferometry to retrieve Rayleigh waves, and we introduce a method to estimate the reliability of the retrieved surface waves. We find stable estimation of surface wave phase velocities between 0.16 and 0.38 Hz. Azimuthal velocity variations show a trend of higher velocities in the NE/SW direction, the strike of the rift zone intersecting Torfajökull, and orientation of erupted lavas on a NE‐SW fissure swarm. Tomographic results indicate low‐velocity anomalies beneath the volcano caldera (between −5% and −10%) and even lower velocity variations in the southeast and southwest study area (below −10%), outside the volcano caldera. Low anomalies may indicate the existence of hot material, more prominent outside the caldera outskirts. High‐velocity variations (between 5% and 10%) outline the volcano caldera between 4‐ and 5‐km depth and more pronounced velocities (between 10% and 15%) up to 5‐km depth in the north of the volcano caldera. We interpret the former as possible caldera collapse structure and the latest as solidified intrusive magma from the old preferred magma paths.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA73
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
Journal or Publication Title: Journal of Geophysical Research-Solid Earth
Identification Number: dooi: 10.1029/2018JB016002
Depositing User: Sarah Humbert
Date Deposited: 14 Sep 2018 09:23
Last Modified: 09 Feb 2021 18:15

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