Closing crack earthquakes within the Krafla caldera, North Iceland
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, wit...
Published in: | Geophysical Journal International |
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Royal Astronomical Society
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:3668 2023-05-15T16:47:01+02:00 Closing crack earthquakes within the Krafla caldera, North Iceland Mildon, Z. Tarasewicz, J. P. T. Pugh, David White, R. S. Brandsdóttir, B. 2016 text archive http://eprints.esc.cam.ac.uk/3668/ http://eprints.esc.cam.ac.uk/3668/1/Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf http://eprints.esc.cam.ac.uk/3668/2/suppl_data.zip http://gji.oxfordjournals.org/content/207/2/1137 https://doi.org/10.1093/gji/ggw325 en eng Royal Astronomical Society http://eprints.esc.cam.ac.uk/3668/1/Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf http://eprints.esc.cam.ac.uk/3668/2/suppl_data.zip 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 <https://doi.org/10.1093/gji/ggw325> cc_by CC-BY 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2016 ftucambridgeesc https://doi.org/10.1093/gji/ggw325 2020-08-27T18:09:44Z 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. Article in Journal/Newspaper Iceland University of Cambridge, Department of Earth Sciences: ESC Publications Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) Geophysical Journal International 207 2 1137 1141 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
02 - Geodynamics Geophysics and Tectonics Mildon, Z. Tarasewicz, J. P. T. Pugh, David White, R. S. Brandsdóttir, B. Closing crack earthquakes within the Krafla caldera, North Iceland |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Mildon, Z. Tarasewicz, J. P. T. Pugh, David White, R. S. Brandsdóttir, B. |
author_facet |
Mildon, Z. Tarasewicz, J. P. T. Pugh, David White, R. S. Brandsdóttir, B. |
author_sort |
Mildon, Z. |
title |
Closing crack earthquakes within the Krafla caldera, North Iceland |
title_short |
Closing crack earthquakes within the Krafla caldera, North Iceland |
title_full |
Closing crack earthquakes within the Krafla caldera, North Iceland |
title_fullStr |
Closing crack earthquakes within the Krafla caldera, North Iceland |
title_full_unstemmed |
Closing crack earthquakes within the Krafla caldera, North Iceland |
title_sort |
closing crack earthquakes within the krafla caldera, north iceland |
publisher |
Royal Astronomical Society |
publishDate |
2016 |
url |
http://eprints.esc.cam.ac.uk/3668/ http://eprints.esc.cam.ac.uk/3668/1/Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf http://eprints.esc.cam.ac.uk/3668/2/suppl_data.zip http://gji.oxfordjournals.org/content/207/2/1137 https://doi.org/10.1093/gji/ggw325 |
long_lat |
ENVELOPE(-16.747,-16.747,65.713,65.713) |
geographic |
Krafla |
geographic_facet |
Krafla |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://eprints.esc.cam.ac.uk/3668/1/Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf http://eprints.esc.cam.ac.uk/3668/2/suppl_data.zip 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 <https://doi.org/10.1093/gji/ggw325> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1093/gji/ggw325 |
container_title |
Geophysical Journal International |
container_volume |
207 |
container_issue |
2 |
container_start_page |
1137 |
op_container_end_page |
1141 |
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1766037125546901504 |