Mildon, ZK;
Pugh, DJ;
Tarasewicz, J;
White, RS;
Brandsdottir, B;
(2016)
Closing crack earthquakes within the Krafla caldera, North Iceland.
Geophysical Journal International
, 207
(2)
pp. 1137-1141.
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.
| Type: | Article |
|---|---|
| Title: | Closing crack earthquakes within the Krafla caldera, North Iceland |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/gji/ggw325 |
| Publisher version: | http://doi.org/10.1093/gji/ggw325 |
| Language: | English |
| Additional information: | © The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Hydrothermal systems, Earthquake source observations, Volcano seismology |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1515849 |
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