Seismic attenuation in Faroe Island 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...
Published in: | Geophysical Prospecting |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2005
|
Subjects: | |
Online Access: | http://eprints.esc.cam.ac.uk/1820/ http://eprints.esc.cam.ac.uk/1820/1/Seismic_attenuation_-_White.pdf https://doi.org/10.1111/j.1365-2478.2007.00665.x |
id |
ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1820 |
---|---|
record_format |
openpolar |
spelling |
ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1820 2023-05-15T16:10:49+02:00 Seismic attenuation in Faroe Island Basalts. Shaw, F. Worthington, M. H. White, R. S. Andersen, M. S. Petersen, U. K. Group, Seifaba 2005 application/pdf http://eprints.esc.cam.ac.uk/1820/ http://eprints.esc.cam.ac.uk/1820/1/Seismic_attenuation_-_White.pdf https://doi.org/10.1111/j.1365-2478.2007.00665.x en eng http://eprints.esc.cam.ac.uk/1820/1/Seismic_attenuation_-_White.pdf Shaw, F. and Worthington, M. H. and White, R. S. and Andersen, M. S. and Petersen, U. K. and Group, Seifaba (2005) Seismic attenuation in Faroe Island Basalts. Expanded Abstracts, 67th Conference, European Association of Geoscientists and Engineers. P502. DOI https://doi.org/10.1111/j.1365-2478.2007.00665.x <https://doi.org/10.1111/j.1365-2478.2007.00665.x> 05 - Petrology - Igneous Metamorphic and Volcanic Studies 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2005 ftucambridgeesc https://doi.org/10.1111/j.1365-2478.2007.00665.x 2020-08-27T18:09:03Z 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 Streymoy ENVELOPE(-7.000,-7.000,62.133,62.133) Vestmanna ENVELOPE(-7.173,-7.173,62.154,62.154) Glyvursnes ENVELOPE(-6.735,-6.735,61.981,61.981) Geophysical Prospecting 56 1 5 20 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
05 - Petrology - Igneous Metamorphic and Volcanic Studies 02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
05 - Petrology - Igneous Metamorphic and Volcanic Studies 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 Island Basalts. |
topic_facet |
05 - Petrology - Igneous Metamorphic and Volcanic Studies 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 Island Basalts. |
title_short |
Seismic attenuation in Faroe Island Basalts. |
title_full |
Seismic attenuation in Faroe Island Basalts. |
title_fullStr |
Seismic attenuation in Faroe Island Basalts. |
title_full_unstemmed |
Seismic attenuation in Faroe Island Basalts. |
title_sort |
seismic attenuation in faroe island basalts. |
publishDate |
2005 |
url |
http://eprints.esc.cam.ac.uk/1820/ http://eprints.esc.cam.ac.uk/1820/1/Seismic_attenuation_-_White.pdf https://doi.org/10.1111/j.1365-2478.2007.00665.x |
long_lat |
ENVELOPE(-7.000,-7.000,62.133,62.133) ENVELOPE(-7.173,-7.173,62.154,62.154) ENVELOPE(-6.735,-6.735,61.981,61.981) |
geographic |
Faroe Islands Streymoy Vestmanna Glyvursnes |
geographic_facet |
Faroe Islands Streymoy Vestmanna Glyvursnes |
genre |
Faroe Islands North Atlantic Streymoy Vestmanna |
genre_facet |
Faroe Islands North Atlantic Streymoy Vestmanna |
op_relation |
http://eprints.esc.cam.ac.uk/1820/1/Seismic_attenuation_-_White.pdf Shaw, F. and Worthington, M. H. and White, R. S. and Andersen, M. S. and Petersen, U. K. and Group, Seifaba (2005) Seismic attenuation in Faroe Island Basalts. Expanded Abstracts, 67th Conference, European Association of Geoscientists and Engineers. P502. 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.1365-2478.2007.00665.x |
container_title |
Geophysical Prospecting |
container_volume |
56 |
container_issue |
1 |
container_start_page |
5 |
op_container_end_page |
20 |
_version_ |
1765995952589504512 |