3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland
From May to September 2013, 21 seismic stations were deployed around the Snæfellsjökull volcano, Iceland. We cross-correlate the five months of seismic noise and measure the Rayleigh wave group velocity dispersion curves to gain more information about the geological structure of the Snæfellsjökull v...
Published in: | Journal of Volcanology and Geothermal Research |
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ftunivgeneve:oai:unige.ch:aou:unige:84110 2023-10-01T03:56:52+02:00 3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland Obermann, Anne Lupi, Matteo Mordret, Aurélien Jakobsdóttir, Steinunn S. Miller, Stephen A. 2016 https://archive-ouverte.unige.ch/unige:84110 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2016.02.013 https://archive-ouverte.unige.ch/unige:84110 unige:84110 info:eu-repo/semantics/restrictedAccess ISSN: 0377-0273 Journal of volcanology and geothermal research, vol. 317 (2016) p. 42-52 Volcano tomography Ambient seismic noise Iceland Shallow magma reservoir Sheet swarm info:eu-repo/semantics/article Text Article scientifique info:eu-repo/semantics/publishedVersion 2016 ftunivgeneve https://doi.org/10.1016/j.jvolgeores.2016.02.013 2023-09-07T07:31:34Z From May to September 2013, 21 seismic stations were deployed around the Snæfellsjökull volcano, Iceland. We cross-correlate the five months of seismic noise and measure the Rayleigh wave group velocity dispersion curves to gain more information about the geological structure of the Snæfellsjökull volcano. In particular, we investigate the occurrence of seismic wave anomalies in the first 6 km of crust. We regionalize the group velocity dispersion curves into 2-D velocity maps between 0.9 and 4.8 s. With a neighborhood algorithm we then locally invert the velocity maps to obtain accurate shear-velocity models down to 6 km depth. Our study highlights three seismic wave anomalies. The deepest, located between approximately 3.3 and 5.5 km depth, is a high velocity anomaly, possibly representing a solidified magma chamber. The second anomaly is also a high velocity anomaly east of the central volcano that starts at the surface and reaches approximately 2.5 km depth. It may represent a gabbroic intrusion or a dense swarm of inclined magmatic sheets (similar to the dike swarms found in the ophiolites), typical of Icelandic volcanic systems. The third anomaly is a low velocity anomaly extending up to 1.5 km depth. This anomaly, located directly below the volcanic edifice, may be interpreted either as a shallow magmatic reservoir (typical of Icelandic central volcanoes), or alternatively as a shallow hydrothermal system developed above the cooling magmatic reservoir. Article in Journal/Newspaper Iceland Snæfellsjökull Université de Genève: Archive ouverte UNIGE Snæfellsjökull ENVELOPE(-23.769,-23.769,64.811,64.811) Journal of Volcanology and Geothermal Research 317 42 52 |
institution |
Open Polar |
collection |
Université de Genève: Archive ouverte UNIGE |
op_collection_id |
ftunivgeneve |
language |
English |
topic |
Volcano tomography Ambient seismic noise Iceland Shallow magma reservoir Sheet swarm |
spellingShingle |
Volcano tomography Ambient seismic noise Iceland Shallow magma reservoir Sheet swarm Obermann, Anne Lupi, Matteo Mordret, Aurélien Jakobsdóttir, Steinunn S. Miller, Stephen A. 3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
topic_facet |
Volcano tomography Ambient seismic noise Iceland Shallow magma reservoir Sheet swarm |
description |
From May to September 2013, 21 seismic stations were deployed around the Snæfellsjökull volcano, Iceland. We cross-correlate the five months of seismic noise and measure the Rayleigh wave group velocity dispersion curves to gain more information about the geological structure of the Snæfellsjökull volcano. In particular, we investigate the occurrence of seismic wave anomalies in the first 6 km of crust. We regionalize the group velocity dispersion curves into 2-D velocity maps between 0.9 and 4.8 s. With a neighborhood algorithm we then locally invert the velocity maps to obtain accurate shear-velocity models down to 6 km depth. Our study highlights three seismic wave anomalies. The deepest, located between approximately 3.3 and 5.5 km depth, is a high velocity anomaly, possibly representing a solidified magma chamber. The second anomaly is also a high velocity anomaly east of the central volcano that starts at the surface and reaches approximately 2.5 km depth. It may represent a gabbroic intrusion or a dense swarm of inclined magmatic sheets (similar to the dike swarms found in the ophiolites), typical of Icelandic volcanic systems. The third anomaly is a low velocity anomaly extending up to 1.5 km depth. This anomaly, located directly below the volcanic edifice, may be interpreted either as a shallow magmatic reservoir (typical of Icelandic central volcanoes), or alternatively as a shallow hydrothermal system developed above the cooling magmatic reservoir. |
format |
Article in Journal/Newspaper |
author |
Obermann, Anne Lupi, Matteo Mordret, Aurélien Jakobsdóttir, Steinunn S. Miller, Stephen A. |
author_facet |
Obermann, Anne Lupi, Matteo Mordret, Aurélien Jakobsdóttir, Steinunn S. Miller, Stephen A. |
author_sort |
Obermann, Anne |
title |
3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
title_short |
3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
title_full |
3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
title_fullStr |
3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
title_full_unstemmed |
3D-ambient noise Rayleigh wave tomography of Snæfellsjökull volcano, Iceland |
title_sort |
3d-ambient noise rayleigh wave tomography of snæfellsjökull volcano, iceland |
publishDate |
2016 |
url |
https://archive-ouverte.unige.ch/unige:84110 |
long_lat |
ENVELOPE(-23.769,-23.769,64.811,64.811) |
geographic |
Snæfellsjökull |
geographic_facet |
Snæfellsjökull |
genre |
Iceland Snæfellsjökull |
genre_facet |
Iceland Snæfellsjökull |
op_source |
ISSN: 0377-0273 Journal of volcanology and geothermal research, vol. 317 (2016) p. 42-52 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2016.02.013 https://archive-ouverte.unige.ch/unige:84110 unige:84110 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2016.02.013 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
317 |
container_start_page |
42 |
op_container_end_page |
52 |
_version_ |
1778527500400328704 |