Closing crack earthquakes within the Krafla caldera, North Iceland

Mildon, Z. and Tarasewicz, J. P. T. and Pugh, David and White, R. S. and Brandsdóttir, B. (2016) Closing crack earthquakes within the Krafla caldera, North Iceland. Geophysical Journal International, 207 (2). pp. 1137-1141. ISSN ISSN: 0956-540X, ESSN: 1365-246X DOI https://doi.org/10.1093/gji/ggw325

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Abstract

Moment tensor analysis with a Bayesian approach was used to analyse a non-double-couple (non-DC) earthquake (Mw ∼ 1) with a high isotropic (implosive) component within the Krafla caldera, Iceland. We deduce that the earthquake was generated by a closing crack at depth. The event is well located, with high signal-to-noise ratio and shows dilatational P-wave first arrivals at all stations where the first arrival can be picked with confidence. Coverage of the focal sphere is comprehensive and the source mechanism stable across the full range of uncertainties. The non-DC event lies within a cluster of microseismic activity including many DC events. Hence, we conclude that it is a true non-DC closing crack earthquake as a result of geothermal utilization and observed magma chamber deflation in the region at present.

Item Type:	Article
Uncontrolled Keywords:	2016AREP; IA70;
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics 07 - Gold Open Access
Journal or Publication Title:	Geophysical Journal International
Volume:	207
Page Range:	pp. 1137-1141
Identification Number:	https://doi.org/10.1093/gji/ggw325
Depositing User:	Sarah Humbert
Date Deposited:	14 Jun 2016 14:57
Last Modified:	24 Oct 2016 17:33
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3668

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