Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland)
Katla is a threatening volcano in Iceland, partly covered by the Mýrdalsjökull ice cap. The volcano has a large caldera with several active geothermal areas. A peculiar cluster of long-period seismic events started on Katla's south flank in July 2011, during an unrest episode in the caldera tha...
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Online Access: | http://hdl.handle.net/11585/567721 https://doi.org/10.1016/j.jvolgeores.2016.05.017 http://www.sciencedirect.com/science/journal/03770273 |
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ftunibolognairis:oai:cris.unibo.it:11585/567721 2024-02-11T10:04:02+01:00 Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) SGATTONI, GIULIA LUCCHI, FEDERICO Jeddi, Zeinab Gudmundsson, Ólafur Einarsson, Páll Tryggvason, Ari Lund, Björn Sgattoni, Giulia Jeddi, Zeinab Gudmundsson, Ólafur Einarsson, Páll Tryggvason, Ari Lund, Björn Lucchi, Federico 2016 STAMPA http://hdl.handle.net/11585/567721 https://doi.org/10.1016/j.jvolgeores.2016.05.017 http://www.sciencedirect.com/science/journal/03770273 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000387197900004 volume:324 firstpage:28 lastpage:40 numberofpages:13 journal:JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH http://hdl.handle.net/11585/567721 doi:10.1016/j.jvolgeores.2016.05.017 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84971241679 http://www.sciencedirect.com/science/journal/03770273 Glacial processe Iceland Katla volcano Long-period earthquake Volcanic processe Geophysic Geochemistry and Petrology info:eu-repo/semantics/article 2016 ftunibolognairis https://doi.org/10.1016/j.jvolgeores.2016.05.017 2024-01-24T17:48:21Z Katla is a threatening volcano in Iceland, partly covered by the Mýrdalsjökull ice cap. The volcano has a large caldera with several active geothermal areas. A peculiar cluster of long-period seismic events started on Katla's south flank in July 2011, during an unrest episode in the caldera that culminated in a glacier outburst. The seismic events were tightly clustered at shallow depth in the Gvendarfell area, 4 km south of the caldera, under a small glacier stream at the southern margin of Mýrdalsjökull. No seismic events were known to have occurred in this area before. The most striking feature of this seismic cluster is its temporal pattern, characterized by regular intervals between repeating seismic events, modulated by a seasonal variation. Remarkable is also the stability of both the time and waveform features over a long time period, around 3.5 years. We have not found any comparable examples in the literature. Both volcanic and glacial processes can produce similar waveforms and therefore have to be considered as potential seismic sources. Discerning between these two causes is critical for monitoring glacier-clad volcanoes and has been controversial at Katla. For this new seismic cluster on the south flank, we regard volcano-related processes as more likely than glacial ones for the following reasons: 1) the seismic activity started during an unrest episode involving sudden melting of the glacier and a jökulhlaup; 2) the glacier stream is small and stagnant; 3) the seismicity remains regular and stable for years; 4) there is no apparent correlation with short-term weather changes, such as rainstorms. We suggest that a small, shallow hydrothermal system was activated on Katla's south flank in 2011, either by a minor magmatic injection or by changes of permeability in a local crack system. Article in Journal/Newspaper glacier Ice cap Iceland Katla Mýrdalsjökull IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Katla ENVELOPE(-19.062,-19.062,63.631,63.631) Mýrdalsjökull ENVELOPE(-19.174,-19.174,63.643,63.643) Gvendarfell ENVELOPE(-19.078,-19.078,63.537,63.537) Journal of Volcanology and Geothermal Research 324 28 40 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Glacial processe Iceland Katla volcano Long-period earthquake Volcanic processe Geophysic Geochemistry and Petrology |
spellingShingle |
Glacial processe Iceland Katla volcano Long-period earthquake Volcanic processe Geophysic Geochemistry and Petrology SGATTONI, GIULIA LUCCHI, FEDERICO Jeddi, Zeinab Gudmundsson, Ólafur Einarsson, Páll Tryggvason, Ari Lund, Björn Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) |
topic_facet |
Glacial processe Iceland Katla volcano Long-period earthquake Volcanic processe Geophysic Geochemistry and Petrology |
description |
Katla is a threatening volcano in Iceland, partly covered by the Mýrdalsjökull ice cap. The volcano has a large caldera with several active geothermal areas. A peculiar cluster of long-period seismic events started on Katla's south flank in July 2011, during an unrest episode in the caldera that culminated in a glacier outburst. The seismic events were tightly clustered at shallow depth in the Gvendarfell area, 4 km south of the caldera, under a small glacier stream at the southern margin of Mýrdalsjökull. No seismic events were known to have occurred in this area before. The most striking feature of this seismic cluster is its temporal pattern, characterized by regular intervals between repeating seismic events, modulated by a seasonal variation. Remarkable is also the stability of both the time and waveform features over a long time period, around 3.5 years. We have not found any comparable examples in the literature. Both volcanic and glacial processes can produce similar waveforms and therefore have to be considered as potential seismic sources. Discerning between these two causes is critical for monitoring glacier-clad volcanoes and has been controversial at Katla. For this new seismic cluster on the south flank, we regard volcano-related processes as more likely than glacial ones for the following reasons: 1) the seismic activity started during an unrest episode involving sudden melting of the glacier and a jökulhlaup; 2) the glacier stream is small and stagnant; 3) the seismicity remains regular and stable for years; 4) there is no apparent correlation with short-term weather changes, such as rainstorms. We suggest that a small, shallow hydrothermal system was activated on Katla's south flank in 2011, either by a minor magmatic injection or by changes of permeability in a local crack system. |
author2 |
Sgattoni, Giulia Jeddi, Zeinab Gudmundsson, Ólafur Einarsson, Páll Tryggvason, Ari Lund, Björn Lucchi, Federico |
format |
Article in Journal/Newspaper |
author |
SGATTONI, GIULIA LUCCHI, FEDERICO Jeddi, Zeinab Gudmundsson, Ólafur Einarsson, Páll Tryggvason, Ari Lund, Björn |
author_facet |
SGATTONI, GIULIA LUCCHI, FEDERICO Jeddi, Zeinab Gudmundsson, Ólafur Einarsson, Páll Tryggvason, Ari Lund, Björn |
author_sort |
SGATTONI, GIULIA |
title |
Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) |
title_short |
Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) |
title_full |
Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) |
title_fullStr |
Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) |
title_full_unstemmed |
Long-period seismic events with strikingly regular temporal patterns on Katla volcano's south flank (Iceland) |
title_sort |
long-period seismic events with strikingly regular temporal patterns on katla volcano's south flank (iceland) |
publishDate |
2016 |
url |
http://hdl.handle.net/11585/567721 https://doi.org/10.1016/j.jvolgeores.2016.05.017 http://www.sciencedirect.com/science/journal/03770273 |
long_lat |
ENVELOPE(-19.062,-19.062,63.631,63.631) ENVELOPE(-19.174,-19.174,63.643,63.643) ENVELOPE(-19.078,-19.078,63.537,63.537) |
geographic |
Katla Mýrdalsjökull Gvendarfell |
geographic_facet |
Katla Mýrdalsjökull Gvendarfell |
genre |
glacier Ice cap Iceland Katla Mýrdalsjökull |
genre_facet |
glacier Ice cap Iceland Katla Mýrdalsjökull |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000387197900004 volume:324 firstpage:28 lastpage:40 numberofpages:13 journal:JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH http://hdl.handle.net/11585/567721 doi:10.1016/j.jvolgeores.2016.05.017 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84971241679 http://www.sciencedirect.com/science/journal/03770273 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2016.05.017 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
324 |
container_start_page |
28 |
op_container_end_page |
40 |
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1790600478203052032 |