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 ($M_w$ ~ 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,...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press
2016
|
Subjects: | |
Online Access: | https://www.repository.cam.ac.uk/handle/1810/261078 https://doi.org/10.17863/CAM.6256 |
id |
ftunivcam:oai:www.repository.cam.ac.uk:1810/261078 |
---|---|
record_format |
openpolar |
spelling |
ftunivcam:oai:www.repository.cam.ac.uk:1810/261078 2024-02-04T10:01:25+01:00 Closing crack earthquakes within the Krafla caldera, North Iceland Mildon, ZK Pugh, DJ Tarasewicz, J White, RS Brandsdóttir, B 2016-11-01 application/pdf https://www.repository.cam.ac.uk/handle/1810/261078 https://doi.org/10.17863/CAM.6256 eng eng Oxford University Press http://dx.doi.org/10.1093/gji/ggw325 Geophysical Journal International https://www.repository.cam.ac.uk/handle/1810/261078 doi:10.17863/CAM.6256 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ hydrothermal systems earthquake source observations volcano seismology Article 2016 ftunivcam https://doi.org/10.17863/CAM.6256 2024-01-11T23:21:16Z Moment tensor analysis with a Bayesian approach was used to analyse a non-double-couple (non-DC) earthquake ($M_w$ ~ 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. Natural Environment Research Council (Grant ID: NE/H025006/1) Article in Journal/Newspaper Iceland Apollo - University of Cambridge Repository Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
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 |
Moment tensor analysis with a Bayesian approach was used to analyse a non-double-couple (non-DC) earthquake ($M_w$ ~ 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. Natural Environment Research Council (Grant ID: NE/H025006/1) |
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 |
publishDate |
2016 |
url |
https://www.repository.cam.ac.uk/handle/1810/261078 https://doi.org/10.17863/CAM.6256 |
long_lat |
ENVELOPE(-16.747,-16.747,65.713,65.713) |
geographic |
Krafla |
geographic_facet |
Krafla |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/261078 doi:10.17863/CAM.6256 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.6256 |
_version_ |
1789967291109081088 |