Seismic attenuation in Faroe Islands basalts
We analysed vertical seismic profiling (VSP) data from two boreholes at Glyvursnes and Vestmanna on the island of Streymoy, Faroe Islands, to determine the magnitude and causes of seismic attenuation in sequences of basalt flows. The work is part of SeiFaBa, a major project integrating data from ver...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:680 2023-05-15T16:10:35+02:00 Seismic attenuation in Faroe Islands basalts Shaw, F. Worthington, M. H. White, R. S. Andersen, M. S. Petersen, U. K. Group, Seifaba 2008-01 application/pdf http://eprints.esc.cam.ac.uk/680/ http://eprints.esc.cam.ac.uk/680/1/Shaw_Worthington_White_Andersen_PetersenGeophy.Pros.5-20,2008.pdf https://doi.org/10.1111/j.1365 en eng http://eprints.esc.cam.ac.uk/680/1/Shaw_Worthington_White_Andersen_PetersenGeophy.Pros.5-20,2008.pdf Shaw, F. and Worthington, M. H. and White, R. S. and Andersen, M. S. and Petersen, U. K. and Group, Seifaba (2008) Seismic attenuation in Faroe Islands basalts. Geophysical Prospecting, 56 (1). pp. 5-20. DOI https://doi.org/10.1111/j.1365- 2478.2007.00665.x <https://doi.org/10.1111/j.1365- 2478.2007.00665.x> 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2008 ftucambridgeesc https://doi.org/10.1111/j.1365 2020-08-27T18:08:37Z We analysed vertical seismic profiling (VSP) data from two boreholes at Glyvursnes and Vestmanna on the island of Streymoy, Faroe Islands, to determine the magnitude and causes of seismic attenuation in sequences of basalt flows. The work is part of SeiFaBa, a major project integrating data from vertical and offset VSP, surface seismic surveys, core samples and wireline log data from the two boreholes. Values of effective seismic quality factor (Q) obtained at Glyvursnes and Vestmanna are sufficiently low to significantly degrade the quality of a surface reflection seismic image. This observation is consistent with results from other VSP experiments in the North Atlantic region. We demonstrate that the most likely cause of the low values of effective Q at Glyvursnes and Vestmanna is a combination of 1D scattering and intrinsic attenuation due to seismic wave-induced fluid flow within pores and microcracks. Tests involving 3D elastic wave numerical modelling with a hypothetical basalt model based on field observations, indicate that little scattering attenuation is caused by lateral variations in basalt structure. Article in Journal/Newspaper Faroe Islands North Atlantic Streymoy Vestmanna University of Cambridge, Department of Earth Sciences: ESC Publications Faroe Islands Glyvursnes ENVELOPE(-6.735,-6.735,61.981,61.981) Streymoy ENVELOPE(-7.000,-7.000,62.133,62.133) Vestmanna ENVELOPE(-7.173,-7.173,62.154,62.154) |
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 Shaw, F. Worthington, M. H. White, R. S. Andersen, M. S. Petersen, U. K. Group, Seifaba Seismic attenuation in Faroe Islands basalts |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
We analysed vertical seismic profiling (VSP) data from two boreholes at Glyvursnes and Vestmanna on the island of Streymoy, Faroe Islands, to determine the magnitude and causes of seismic attenuation in sequences of basalt flows. The work is part of SeiFaBa, a major project integrating data from vertical and offset VSP, surface seismic surveys, core samples and wireline log data from the two boreholes. Values of effective seismic quality factor (Q) obtained at Glyvursnes and Vestmanna are sufficiently low to significantly degrade the quality of a surface reflection seismic image. This observation is consistent with results from other VSP experiments in the North Atlantic region. We demonstrate that the most likely cause of the low values of effective Q at Glyvursnes and Vestmanna is a combination of 1D scattering and intrinsic attenuation due to seismic wave-induced fluid flow within pores and microcracks. Tests involving 3D elastic wave numerical modelling with a hypothetical basalt model based on field observations, indicate that little scattering attenuation is caused by lateral variations in basalt structure. |
format |
Article in Journal/Newspaper |
author |
Shaw, F. Worthington, M. H. White, R. S. Andersen, M. S. Petersen, U. K. Group, Seifaba |
author_facet |
Shaw, F. Worthington, M. H. White, R. S. Andersen, M. S. Petersen, U. K. Group, Seifaba |
author_sort |
Shaw, F. |
title |
Seismic attenuation in Faroe Islands basalts |
title_short |
Seismic attenuation in Faroe Islands basalts |
title_full |
Seismic attenuation in Faroe Islands basalts |
title_fullStr |
Seismic attenuation in Faroe Islands basalts |
title_full_unstemmed |
Seismic attenuation in Faroe Islands basalts |
title_sort |
seismic attenuation in faroe islands basalts |
publishDate |
2008 |
url |
http://eprints.esc.cam.ac.uk/680/ http://eprints.esc.cam.ac.uk/680/1/Shaw_Worthington_White_Andersen_PetersenGeophy.Pros.5-20,2008.pdf https://doi.org/10.1111/j.1365 |
long_lat |
ENVELOPE(-6.735,-6.735,61.981,61.981) ENVELOPE(-7.000,-7.000,62.133,62.133) ENVELOPE(-7.173,-7.173,62.154,62.154) |
geographic |
Faroe Islands Glyvursnes Streymoy Vestmanna |
geographic_facet |
Faroe Islands Glyvursnes Streymoy Vestmanna |
genre |
Faroe Islands North Atlantic Streymoy Vestmanna |
genre_facet |
Faroe Islands North Atlantic Streymoy Vestmanna |
op_relation |
http://eprints.esc.cam.ac.uk/680/1/Shaw_Worthington_White_Andersen_PetersenGeophy.Pros.5-20,2008.pdf Shaw, F. and Worthington, M. H. and White, R. S. and Andersen, M. S. and Petersen, U. K. and Group, Seifaba (2008) Seismic attenuation in Faroe Islands basalts. Geophysical Prospecting, 56 (1). pp. 5-20. DOI https://doi.org/10.1111/j.1365- 2478.2007.00665.x <https://doi.org/10.1111/j.1365- 2478.2007.00665.x> |
op_doi |
https://doi.org/10.1111/j.1365 |
_version_ |
1765995750137790464 |