Closing crack earthquakes within the Krafla caldera, North Iceland
<jats:title>Abstract</jats:title> <jats:p>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...
Published in: | Geophysical Journal International |
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Language: | English |
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Oxford University Press (OUP)
2016
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Online Access: | http://hdl.handle.net/10026.1/10721 https://doi.org/10.1093/gji/ggw325 |
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ftunivplympearl:oai:pearl.plymouth.ac.uk:10026.1/10721 2024-06-09T07:47:00+00:00 Closing crack earthquakes within the Krafla caldera, North Iceland Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdóttir, B 2016-11-01 1137-1141 application/pdf http://hdl.handle.net/10026.1/10721 https://doi.org/10.1093/gji/ggw325 en eng Oxford University Press (OUP) ISSN:1365-246X E-ISSN:1365-246X 1365-246X http://hdl.handle.net/10026.1/10721 doi:10.1093/gji/ggw325 Not known Hydrothermal systems Earthquake source observations Volcano seismology journal-article Article 2016 ftunivplympearl https://doi.org/10.1093/gji/ggw325 2024-05-14T23:48:21Z <jats:title>Abstract</jats:title> <jats:p>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.</jats:p> Article in Journal/Newspaper Iceland PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) Geophysical Journal International 207 2 1137 1141 |
institution |
Open Polar |
collection |
PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) |
op_collection_id |
ftunivplympearl |
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 Brandsdóttir, B Closing crack earthquakes within the Krafla caldera, North Iceland |
topic_facet |
Hydrothermal systems Earthquake source observations Volcano seismology |
description |
<jats:title>Abstract</jats:title> <jats:p>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.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdóttir, B |
author_facet |
Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdóttir, 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 |
Oxford University Press (OUP) |
publishDate |
2016 |
url |
http://hdl.handle.net/10026.1/10721 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 |
ISSN:1365-246X E-ISSN:1365-246X 1365-246X http://hdl.handle.net/10026.1/10721 doi:10.1093/gji/ggw325 |
op_rights |
Not known |
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 |
_version_ |
1801377074927108096 |