Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch
Average fundamental mode group velocities and attenuation coefficients of Rayleigh waves have been obtained in a region of the Western North Atlantic comprising the Bermuda Rise, the volcanic Caribbean Arch, and normal seafloor greater than 65 Myr in age. The average Rayleigh wave attenuation coeffi...
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1982
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fthighwire:oai:open-archive.highwire.org:gji:71/3/703 2023-05-15T17:33:50+02:00 Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch Canas, José A. 1982-12-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/71/3/703 https://doi.org/10.1111/j.1365-246X.1982.tb02793.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/71/3/703 http://dx.doi.org/10.1111/j.1365-246X.1982.tb02793.x Copyright (C) 1982, Oxford University Press Articles TEXT 1982 fthighwire https://doi.org/10.1111/j.1365-246X.1982.tb02793.x 2012-11-23T22:12:41Z Average fundamental mode group velocities and attenuation coefficients of Rayleigh waves have been obtained in a region of the Western North Atlantic comprising the Bermuda Rise, the volcanic Caribbean Arch, and normal seafloor greater than 65 Myr in age. The average Rayleigh wave attenuation coefficients decrease from a value of 7.78 × 10-4 km-1 at a period of 15s to a value of 0.21 × 10-4 km-1 at a period of 100 s. Attenuation values and Q R factors obtained are characteristic of a young oceanic region, and they do not correspond to a typical region greater than 65 Myr in age. It is apparent from the data that the high attenuation values reported are due to the effect that the back-arc basin behind the Caribbean Arch has on Rayleigh wave attenuation. Inversion theory applied to the attenuation data yields a Q -1 β model presenting the same features as those corresponding to extension zones such as the spreading centres of the Atlantic and Pacific Oceans. The low-Q region in the model is situated between depths of around 15 and 100 km, with the maximum Q -1 β value (∼17 × 10-3)occurring at about 50 km depth. Text North Atlantic HighWire Press (Stanford University) Pacific Geophysical Journal International 71 3 703 713 |
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Articles Canas, José A. Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch |
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description |
Average fundamental mode group velocities and attenuation coefficients of Rayleigh waves have been obtained in a region of the Western North Atlantic comprising the Bermuda Rise, the volcanic Caribbean Arch, and normal seafloor greater than 65 Myr in age. The average Rayleigh wave attenuation coefficients decrease from a value of 7.78 × 10-4 km-1 at a period of 15s to a value of 0.21 × 10-4 km-1 at a period of 100 s. Attenuation values and Q R factors obtained are characteristic of a young oceanic region, and they do not correspond to a typical region greater than 65 Myr in age. It is apparent from the data that the high attenuation values reported are due to the effect that the back-arc basin behind the Caribbean Arch has on Rayleigh wave attenuation. Inversion theory applied to the attenuation data yields a Q -1 β model presenting the same features as those corresponding to extension zones such as the spreading centres of the Atlantic and Pacific Oceans. The low-Q region in the model is situated between depths of around 15 and 100 km, with the maximum Q -1 β value (∼17 × 10-3)occurring at about 50 km depth. |
format |
Text |
author |
Canas, José A. |
author_facet |
Canas, José A. |
author_sort |
Canas, José A. |
title |
Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch |
title_short |
Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch |
title_full |
Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch |
title_fullStr |
Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch |
title_full_unstemmed |
Rayleigh wave anelastic attenuation across the Bermuda Rise and the volcanic Caribbean Arch |
title_sort |
rayleigh wave anelastic attenuation across the bermuda rise and the volcanic caribbean arch |
publisher |
Oxford University Press |
publishDate |
1982 |
url |
http://gji.oxfordjournals.org/cgi/content/short/71/3/703 https://doi.org/10.1111/j.1365-246X.1982.tb02793.x |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/71/3/703 http://dx.doi.org/10.1111/j.1365-246X.1982.tb02793.x |
op_rights |
Copyright (C) 1982, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1982.tb02793.x |
container_title |
Geophysical Journal International |
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71 |
container_issue |
3 |
container_start_page |
703 |
op_container_end_page |
713 |
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1766132476304949248 |