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...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:1515849 2023-12-24T10:17:46+01:00 Closing crack earthquakes within the Krafla caldera, North Iceland Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdottir, B 2016-09-04 text https://discovery.ucl.ac.uk/id/eprint/1515849/7/mildon_Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf https://discovery.ucl.ac.uk/id/eprint/1515849/ eng eng Wiley-Blackwell https://discovery.ucl.ac.uk/id/eprint/1515849/7/mildon_Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf https://discovery.ucl.ac.uk/id/eprint/1515849/ open Geophysical Journal International , 207 (2) pp. 1137-1141. (2016) Hydrothermal systems Earthquake source observations Volcano seismology Article 2016 ftucl 2023-11-27T13:07:36Z 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 College London: UCL Discovery Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Hydrothermal systems Earthquake source observations Volcano seismology |
spellingShingle |
Hydrothermal systems Earthquake source observations Volcano seismology Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdottir, B Closing crack earthquakes within the Krafla caldera, North Iceland |
topic_facet |
Hydrothermal systems Earthquake source observations Volcano seismology |
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, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdottir, B |
author_facet |
Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdottir, B |
author_sort |
Mildon, ZK |
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 |
Wiley-Blackwell |
publishDate |
2016 |
url |
https://discovery.ucl.ac.uk/id/eprint/1515849/7/mildon_Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf https://discovery.ucl.ac.uk/id/eprint/1515849/ |
long_lat |
ENVELOPE(-16.747,-16.747,65.713,65.713) |
geographic |
Krafla |
geographic_facet |
Krafla |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geophysical Journal International , 207 (2) pp. 1137-1141. (2016) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/1515849/7/mildon_Geophys.%20J.%20Int.-2016-Mildon-1137-41.pdf https://discovery.ucl.ac.uk/id/eprint/1515849/ |
op_rights |
open |
_version_ |
1786206115697000448 |