Ágústsdóttir, Thorbjörg and Woods, Jennifer and Greenfield, Tim and Green, Robert G. and White, R. S. and Winder, Tom and Brandsdóttir, Bryndís and Steinthórsson, Sveinbjörn and Soosalu, Heidi (2016) Strike-slip Faulting during the 2014 Bárðarbunga-Holuhraun Dike Intrusion, Central Iceland. Geophysical Research Letters, 43 (4). pp. 1495-1503. ISSN 0094-8276, ESSN: 1944-8007 DOI https://doi.org/10.1002/2015GL067423
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Abstract
Over a 13 day period magma propagated laterally from the sub-glacial 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 hours. During each surge forward, seismicity behind the dike tip dropped. Moment tensor solutions from the leading edge show exclusively left-lateral strike-slip faulting sub-parallel 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.
Item Type: | Article |
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Uncontrolled Keywords: | 2015AREP; IA70; weekly list |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics 10 - Explosive Earth 12 - PhD 06 - Part-III Projects |
Journal or Publication Title: | Geophysical Research Letters |
Volume: | 43 |
Page Range: | pp. 1495-1503 |
Identification Number: | https://doi.org/10.1002/2015GL067423 |
Depositing User: | Sarah Humbert |
Date Deposited: | 15 Jan 2016 14:19 |
Last Modified: | 26 Nov 2018 16:22 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/3539 |
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