Strike-slip faulting during the 2014 Bárðarbunga-Holuhraun dike intrusion, central Iceland

Over a 13?day period magma propagated laterally from the subglacial Bárðarbunga volcano in the northern rift zone, Iceland. It created >?30,000 earthquakes at 5–7?km depth along a 48?km path before erupting on 29 August 2014. The seismicity, which tracked the dike propagation, advanced in short b...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Ágústsdóttir, Thorbjörg, Woods, Jennifer, Greenfield, Tim, Green, Robert G., White, Robert S., Winder, Tom, Brandsdóttir, Bryndís, Steinthórsson, Sveinbjörn, Soosalu, Heidi
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Holuhraun
Iceland
Online Access:https://eprints.soton.ac.uk/401275/
https://eprints.soton.ac.uk/401275/1/A%25CC%2581gu%25CC%2581stsdo%25CC%2581ttir%2520et%2520al.%2520-%25202016%2520-%2520Strike-slip%2520faulting%2520during%2520the%25202014%2520Ba%25CC%2581r%25C3%25B0arbunga-%2520Holuhraun%2520dike%2520intrusion%252C%2520central%2520Iceland.pdf
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Summary:Over a 13?day period magma propagated laterally from the subglacial Bárðarbunga volcano in the northern rift zone, Iceland. It created >?30,000 earthquakes at 5–7?km depth along a 48?km path before erupting on 29 August 2014. The seismicity, which tracked the dike propagation, advanced in short bursts at 0.3–4.7?km/h separated by pauses of up to 81?h. During each surge forward, seismicity behind the dike tip dropped. Moment tensor solutions from the leading edge show exclusively left-lateral strike-slip faulting subparallel to the advancing dike tip, releasing accumulated strain deficit in the brittle layer of the rift zone. Behind the leading edge, both left- and right-lateral strike-slip earthquakes are observed. The lack of non-double-couple earthquakes implies that the dike opening was aseismic.

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