Seismic attenuation in Faroe Islands basalts
ABSTRACT 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...
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crwiley:10.1111/j.1365-2478.2007.00665.x 2024-09-15T18:05:35+00:00 Seismic attenuation in Faroe Islands basalts Shaw, F. Worthington, M.H. White, R.S. Andersen, M.S. Petersen, U.K. 2007 http://dx.doi.org/10.1111/j.1365-2478.2007.00665.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2478.2007.00665.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2478.2007.00665.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geophysical Prospecting volume 56, issue 1, page 5-20 ISSN 0016-8025 1365-2478 journal-article 2007 crwiley https://doi.org/10.1111/j.1365-2478.2007.00665.x 2024-08-09T04:29:49Z ABSTRACT 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 micro‐cracks. 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 Wiley Online Library Geophysical Prospecting 56 1 5 20 |
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English |
description |
ABSTRACT 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 micro‐cracks. 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. |
spellingShingle |
Shaw, F. Worthington, M.H. White, R.S. Andersen, M.S. Petersen, U.K. Seismic attenuation in Faroe Islands basalts |
author_facet |
Shaw, F. Worthington, M.H. White, R.S. Andersen, M.S. Petersen, U.K. |
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 |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1365-2478.2007.00665.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2478.2007.00665.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2478.2007.00665.x |
genre |
Faroe Islands North Atlantic Streymoy Vestmanna |
genre_facet |
Faroe Islands North Atlantic Streymoy Vestmanna |
op_source |
Geophysical Prospecting volume 56, issue 1, page 5-20 ISSN 0016-8025 1365-2478 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2478.2007.00665.x |
container_title |
Geophysical Prospecting |
container_volume |
56 |
container_issue |
1 |
container_start_page |
5 |
op_container_end_page |
20 |
_version_ |
1810443123916013568 |