Strike-slip Faulting during the 2014 Bárðarbunga-Holuhraun Dike Intrusion, Central Iceland.

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 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
Uncontrolled Keywords:	2015AREP; IA70; weekly list
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	10 - Explosive Earth
Journal or Publication Title:	Geophysical Research Letters
Volume:	43
Page Range:	pp. 1495-1503
Identification Number:	10.1002/2015GL067423
Depositing User:	Sarah Humbert
Date Deposited:	15 Jan 2016 14:19
Last Modified:	03 Nov 2016 12:24
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3539

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