Structure of the upper mantle under the Antarctic Plate from surface wave tomography
We have analyzed surface wave data for 245 events occurring in Antarctica and surrounding oceans during years 1991-1999. We first apply dispersion analysis to the fundamental mode of Rayleigh waves for periods ranging from 20 to 150 sec. We then invert path-averaged dispersion curves to obtain 2D ma...
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Online Access: | http://hdl.handle.net/2122/15006 https://doi.org/10.1029/2001GL013431 |
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ftingv:oai:www.earth-prints.org:2122/15006 2023-05-15T14:01:37+02:00 Structure of the upper mantle under the Antarctic Plate from surface wave tomography Danesi, Stefania Morelli, Andrea Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia 2001 http://hdl.handle.net/2122/15006 https://doi.org/10.1029/2001GL013431 en eng AGU Geophysical Research Letters 23/28 (2001) 0094-8276 http://hdl.handle.net/2122/15006 doi:10.1029/2001GL013431 restricted article 2001 ftingv https://doi.org/10.1029/2001GL013431 2022-07-29T06:07:14Z We have analyzed surface wave data for 245 events occurring in Antarctica and surrounding oceans during years 1991-1999. We first apply dispersion analysis to the fundamental mode of Rayleigh waves for periods ranging from 20 to 150 sec. We then invert path-averaged dispersion curves to obtain 2D maps of group velocity for different periods, represented by splines on a grid with 250 km spacing, with considerably more detail than that achieved by global models. We finally use group velocity maps in a nonlinear inversion for the regional 3D υSV structure of the upper mantle. The resulting model shows thick continental roots under East Antarctica, reaching depths below 200 km; low velocities under oceanic ridges, mostly confined to the upper 150 km; and a slow area under the Ross Sea volcanic centres, extending all the way down to 200 km, beyond which our data loose resolving power. Published 4395-4398 1T. Struttura della Terra JCR Journal Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ross Sea Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic East Antarctica Ross Sea The Antarctic Geophysical Research Letters 28 23 4395 4398 |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
description |
We have analyzed surface wave data for 245 events occurring in Antarctica and surrounding oceans during years 1991-1999. We first apply dispersion analysis to the fundamental mode of Rayleigh waves for periods ranging from 20 to 150 sec. We then invert path-averaged dispersion curves to obtain 2D maps of group velocity for different periods, represented by splines on a grid with 250 km spacing, with considerably more detail than that achieved by global models. We finally use group velocity maps in a nonlinear inversion for the regional 3D υSV structure of the upper mantle. The resulting model shows thick continental roots under East Antarctica, reaching depths below 200 km; low velocities under oceanic ridges, mostly confined to the upper 150 km; and a slow area under the Ross Sea volcanic centres, extending all the way down to 200 km, beyond which our data loose resolving power. Published 4395-4398 1T. Struttura della Terra JCR Journal |
author2 |
Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia |
format |
Article in Journal/Newspaper |
author |
Danesi, Stefania Morelli, Andrea |
spellingShingle |
Danesi, Stefania Morelli, Andrea Structure of the upper mantle under the Antarctic Plate from surface wave tomography |
author_facet |
Danesi, Stefania Morelli, Andrea |
author_sort |
Danesi, Stefania |
title |
Structure of the upper mantle under the Antarctic Plate from surface wave tomography |
title_short |
Structure of the upper mantle under the Antarctic Plate from surface wave tomography |
title_full |
Structure of the upper mantle under the Antarctic Plate from surface wave tomography |
title_fullStr |
Structure of the upper mantle under the Antarctic Plate from surface wave tomography |
title_full_unstemmed |
Structure of the upper mantle under the Antarctic Plate from surface wave tomography |
title_sort |
structure of the upper mantle under the antarctic plate from surface wave tomography |
publisher |
AGU |
publishDate |
2001 |
url |
http://hdl.handle.net/2122/15006 https://doi.org/10.1029/2001GL013431 |
geographic |
Antarctic East Antarctica Ross Sea The Antarctic |
geographic_facet |
Antarctic East Antarctica Ross Sea The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ross Sea |
op_relation |
Geophysical Research Letters 23/28 (2001) 0094-8276 http://hdl.handle.net/2122/15006 doi:10.1029/2001GL013431 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1029/2001GL013431 |
container_title |
Geophysical Research Letters |
container_volume |
28 |
container_issue |
23 |
container_start_page |
4395 |
op_container_end_page |
4398 |
_version_ |
1766271568012378112 |