Group velocity of Rayleigh waves in the Antarctic region
We analyzed dispersion of intermediate and long period surface waves, recorded at permanent observatories in the Antarctic region, in a tomographic study based on group velocity. We considered Rayleigh waves from available records of all events which occurred during years 1991-1995, with latitude lo...
Published in: | Physics of the Earth and Planetary Interiors |
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ftingv:oai:www.earth-prints.org:2122/15007 2023-05-15T14:01:37+02:00 Group velocity of Rayleigh waves in the Antarctic region Danesi, Stefania Morelli, Andrea Istituto Nazionale di Geofisica 2000 http://hdl.handle.net/2122/15007 https://doi.org/10.1016/S0031-9201(00)00186-2 en eng Elsevier Physics of the Earth and Planetary Interiors /122 (2000) 0031-9201 http://hdl.handle.net/2122/15007 doi:10.1016/S0031-9201(00)00186-2 restricted article 2000 ftingv https://doi.org/10.1016/S0031-9201(00)00186-2 2022-07-29T06:07:14Z We analyzed dispersion of intermediate and long period surface waves, recorded at permanent observatories in the Antarctic region, in a tomographic study based on group velocity. We considered Rayleigh waves from available records of all events which occurred during years 1991-1995, with latitude lower than 40°S and magnitude M≥5.0. We performed classic single-station dispersion analysis on the surface wave train to measure group velocity of the Rayleigh fundamental mode in the period range between 30 and 120 s. We iteratively applied two different techniques of filter analysis: a multiple-filter [Dziewonski et al., 1969] and a phase-matched filter algorithm [Herrin, and Goforth, 1977]. We used such dispersion measurements to compute two-dimensional maps of velocity anomalies in the region. We parameterized group velocity with linear splines, and inverted the linear system by means of singular value decomposition. Results are in significant agreement with earlier studies, but reach a considerably higher detail. Our model differentiates well among geologically different regions, such as the old East Antarctica craton, the accreted terranes of West Antarctica, and the oceanic lithosphere surrounded by the ring of mid-ocean ridges. We image slow areas corresponding to hot-spot regions, including a broad anomaly corresponding to recent volcanism in the Ross Sea, where the existence of a mantle plume has been proposed. Published 55-66 1T. Struttura della Terra JCR Journal Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ross Sea West Antarctica Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic East Antarctica Ross Sea The Antarctic West Antarctica Physics of the Earth and Planetary Interiors 122 1-2 55 66 |
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Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
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ftingv |
language |
English |
description |
We analyzed dispersion of intermediate and long period surface waves, recorded at permanent observatories in the Antarctic region, in a tomographic study based on group velocity. We considered Rayleigh waves from available records of all events which occurred during years 1991-1995, with latitude lower than 40°S and magnitude M≥5.0. We performed classic single-station dispersion analysis on the surface wave train to measure group velocity of the Rayleigh fundamental mode in the period range between 30 and 120 s. We iteratively applied two different techniques of filter analysis: a multiple-filter [Dziewonski et al., 1969] and a phase-matched filter algorithm [Herrin, and Goforth, 1977]. We used such dispersion measurements to compute two-dimensional maps of velocity anomalies in the region. We parameterized group velocity with linear splines, and inverted the linear system by means of singular value decomposition. Results are in significant agreement with earlier studies, but reach a considerably higher detail. Our model differentiates well among geologically different regions, such as the old East Antarctica craton, the accreted terranes of West Antarctica, and the oceanic lithosphere surrounded by the ring of mid-ocean ridges. We image slow areas corresponding to hot-spot regions, including a broad anomaly corresponding to recent volcanism in the Ross Sea, where the existence of a mantle plume has been proposed. Published 55-66 1T. Struttura della Terra JCR Journal |
author2 |
Istituto Nazionale di Geofisica |
format |
Article in Journal/Newspaper |
author |
Danesi, Stefania Morelli, Andrea |
spellingShingle |
Danesi, Stefania Morelli, Andrea Group velocity of Rayleigh waves in the Antarctic region |
author_facet |
Danesi, Stefania Morelli, Andrea |
author_sort |
Danesi, Stefania |
title |
Group velocity of Rayleigh waves in the Antarctic region |
title_short |
Group velocity of Rayleigh waves in the Antarctic region |
title_full |
Group velocity of Rayleigh waves in the Antarctic region |
title_fullStr |
Group velocity of Rayleigh waves in the Antarctic region |
title_full_unstemmed |
Group velocity of Rayleigh waves in the Antarctic region |
title_sort |
group velocity of rayleigh waves in the antarctic region |
publisher |
Elsevier |
publishDate |
2000 |
url |
http://hdl.handle.net/2122/15007 https://doi.org/10.1016/S0031-9201(00)00186-2 |
geographic |
Antarctic East Antarctica Ross Sea The Antarctic West Antarctica |
geographic_facet |
Antarctic East Antarctica Ross Sea The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ross Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ross Sea West Antarctica |
op_relation |
Physics of the Earth and Planetary Interiors /122 (2000) 0031-9201 http://hdl.handle.net/2122/15007 doi:10.1016/S0031-9201(00)00186-2 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1016/S0031-9201(00)00186-2 |
container_title |
Physics of the Earth and Planetary Interiors |
container_volume |
122 |
container_issue |
1-2 |
container_start_page |
55 |
op_container_end_page |
66 |
_version_ |
1766271568366796800 |