Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption
Magma is transported in brittle rock through dikes and sills. This movement may be accompanied by the release of seismic energy that can be tracked from the Earth's surface. Locating dikes and deciphering their dynamics is therefore of prime importance in understanding and potentially forecasti...
Published in: | Journal of Geophysical Research: Solid Earth |
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Language: | English |
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Online Access: | http://eprints.esc.cam.ac.uk/4075/ http://eprints.esc.cam.ac.uk/4075/1/Caudron_et_al-2018-Journal_of_Geophysical_Research__Solid_Earth.pdf http://onlinelibrary.wiley.com/doi/10.1002/2017JB014660/full https://doi.org/10.1002/2017JB014660 |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:4075 2023-05-15T16:51:30+02:00 Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption Caudron, C. White, R. S. Green, R. G. Woods, J. Ágústsdóttir, T. Donaldson, C. Greenfield, T. Rivalta, E. Brandsdóttir, B. 2017 text http://eprints.esc.cam.ac.uk/4075/ http://eprints.esc.cam.ac.uk/4075/1/Caudron_et_al-2018-Journal_of_Geophysical_Research__Solid_Earth.pdf http://onlinelibrary.wiley.com/doi/10.1002/2017JB014660/full https://doi.org/10.1002/2017JB014660 en eng AGU http://eprints.esc.cam.ac.uk/4075/1/Caudron_et_al-2018-Journal_of_Geophysical_Research__Solid_Earth.pdf Caudron, C. and White, R. S. and Green, R. G. and Woods, J. and Ágústsdóttir, T. and Donaldson, C. and Greenfield, T. and Rivalta, E. and Brandsdóttir, B. (2017) Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption. Journal of Geophysical Research-Solid Earth, 123 (1). pp. 264-276. ISSN 0148-0227 DOI https://doi.org/10.1002/2017JB014660 <https://doi.org/10.1002/2017JB014660> cc_by_nc CC-BY-NC 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2017 ftucambridgeesc https://doi.org/10.1002/2017JB014660 2020-08-27T18:09:55Z Magma is transported in brittle rock through dikes and sills. This movement may be accompanied by the release of seismic energy that can be tracked from the Earth's surface. Locating dikes and deciphering their dynamics is therefore of prime importance in understanding and potentially forecasting volcanic eruptions. The Seismic Amplitude Ratio Analysis (SARA) method aims to track melt propagation using the amplitudes recorded across a seismic network without picking the arrival times of individual earthquake phases. This study validates this methodology by comparing SARA locations (filtered between 2 and 16 Hz) with the earthquake locations (same frequency band) recorded during the 2014–2015 Bár urn:x-wiley:jgrb:media:jgrb52508:jgrb52508-math-0003arbunga‐Holuhraun dike intrusion and eruption in Iceland. Integrating both approaches also provides the opportunity to investigate the spatiotemporal characteristics of magma migration during the dike intrusion and ensuing eruption. During the intrusion SARA locations correspond remarkably well to the locations of earthquakes. Several exceptions are, however, observed. (1) A low‐frequency signal was possibly associated with a subglacial eruption on 23 August. (2) A systematic retreat of the seismicity was also observed to the back of each active segment during stalled phases and was associated with a larger spatial extent of the seismic energy source. This behavior may be controlled by the dike's shape and/or by dike inflation. (3) During the eruption SARA locations consistently focused at the eruptive site. (4) Tremor‐rich signal close to ice cauldrons occurred on 3 September. This study demonstrates the power of the SARA methodology, provided robust site amplification; Quality Factors and seismic velocities are available. Article in Journal/Newspaper Iceland University of Cambridge, Department of Earth Sciences: ESC Publications Bár ENVELOPE(-20.913,-20.913,63.904,63.904) Holuhraun ENVELOPE(-16.831,-16.831,64.852,64.852) Journal of Geophysical Research: Solid Earth 123 1 264 276 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
02 - Geodynamics Geophysics and Tectonics Caudron, C. White, R. S. Green, R. G. Woods, J. Ágústsdóttir, T. Donaldson, C. Greenfield, T. Rivalta, E. Brandsdóttir, B. Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
Magma is transported in brittle rock through dikes and sills. This movement may be accompanied by the release of seismic energy that can be tracked from the Earth's surface. Locating dikes and deciphering their dynamics is therefore of prime importance in understanding and potentially forecasting volcanic eruptions. The Seismic Amplitude Ratio Analysis (SARA) method aims to track melt propagation using the amplitudes recorded across a seismic network without picking the arrival times of individual earthquake phases. This study validates this methodology by comparing SARA locations (filtered between 2 and 16 Hz) with the earthquake locations (same frequency band) recorded during the 2014–2015 Bár urn:x-wiley:jgrb:media:jgrb52508:jgrb52508-math-0003arbunga‐Holuhraun dike intrusion and eruption in Iceland. Integrating both approaches also provides the opportunity to investigate the spatiotemporal characteristics of magma migration during the dike intrusion and ensuing eruption. During the intrusion SARA locations correspond remarkably well to the locations of earthquakes. Several exceptions are, however, observed. (1) A low‐frequency signal was possibly associated with a subglacial eruption on 23 August. (2) A systematic retreat of the seismicity was also observed to the back of each active segment during stalled phases and was associated with a larger spatial extent of the seismic energy source. This behavior may be controlled by the dike's shape and/or by dike inflation. (3) During the eruption SARA locations consistently focused at the eruptive site. (4) Tremor‐rich signal close to ice cauldrons occurred on 3 September. This study demonstrates the power of the SARA methodology, provided robust site amplification; Quality Factors and seismic velocities are available. |
format |
Article in Journal/Newspaper |
author |
Caudron, C. White, R. S. Green, R. G. Woods, J. Ágústsdóttir, T. Donaldson, C. Greenfield, T. Rivalta, E. Brandsdóttir, B. |
author_facet |
Caudron, C. White, R. S. Green, R. G. Woods, J. Ágústsdóttir, T. Donaldson, C. Greenfield, T. Rivalta, E. Brandsdóttir, B. |
author_sort |
Caudron, C. |
title |
Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption |
title_short |
Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption |
title_full |
Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption |
title_fullStr |
Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption |
title_full_unstemmed |
Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption |
title_sort |
seismic amplitude ratio analysis of the bárðarbunga-holuhraun dike propagation and eruption |
publisher |
AGU |
publishDate |
2017 |
url |
http://eprints.esc.cam.ac.uk/4075/ http://eprints.esc.cam.ac.uk/4075/1/Caudron_et_al-2018-Journal_of_Geophysical_Research__Solid_Earth.pdf http://onlinelibrary.wiley.com/doi/10.1002/2017JB014660/full https://doi.org/10.1002/2017JB014660 |
long_lat |
ENVELOPE(-20.913,-20.913,63.904,63.904) ENVELOPE(-16.831,-16.831,64.852,64.852) |
geographic |
Bár Holuhraun |
geographic_facet |
Bár Holuhraun |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://eprints.esc.cam.ac.uk/4075/1/Caudron_et_al-2018-Journal_of_Geophysical_Research__Solid_Earth.pdf Caudron, C. and White, R. S. and Green, R. G. and Woods, J. and Ágústsdóttir, T. and Donaldson, C. and Greenfield, T. and Rivalta, E. and Brandsdóttir, B. (2017) Seismic amplitude ratio analysis of the Bárðarbunga-Holuhraun dike propagation and eruption. Journal of Geophysical Research-Solid Earth, 123 (1). pp. 264-276. ISSN 0148-0227 DOI https://doi.org/10.1002/2017JB014660 <https://doi.org/10.1002/2017JB014660> |
op_rights |
cc_by_nc |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1002/2017JB014660 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
123 |
container_issue |
1 |
container_start_page |
264 |
op_container_end_page |
276 |
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1766041617690525696 |