Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data.
The Bruce, Discovery, Herdman and Jane banks, all located along the central-eastern part of the South Scotia Ridge, represent isolated topographic highs, surrounded by young oceanic crust (~5–23 Ma), whose petrological and structural nature is still the subject of speculation due to the lack of rele...
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Online Access: | http://hdl.handle.net/11368/1698575 https://doi.org/10.1017/S0954102005002488 |
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ftunitriestiris:oai:arts.units.it:11368/1698575 2023-05-15T13:31:04+02:00 Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. VUAN A. LODOLO E. SAULI C. PANZA, GIULIANO Vuan, A. Lodolo, E. Panza, Giuliano Sauli, C. 2005 STAMPA http://hdl.handle.net/11368/1698575 https://doi.org/10.1017/S0954102005002488 eng eng volume:17 firstpage:97 lastpage:106 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11368/1698575 doi:10.1017/S0954102005002488 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-15244359763 continental crust multichannel seismic profile South Scotia Ridge surface wave tomography info:eu-repo/semantics/article 2005 ftunitriestiris https://doi.org/10.1017/S0954102005002488 2023-04-09T06:02:23Z The Bruce, Discovery, Herdman and Jane banks, all located along the central-eastern part of the South Scotia Ridge, represent isolated topographic highs, surrounded by young oceanic crust (~5–23 Ma), whose petrological and structural nature is still the subject of speculation due to the lack of relevant data. Surface wave tomography in and around the Scotia Sea region, performed using eight broadband seismic stations and 300 events, shows that the central-eastern part of the South Scotia Ridge is characterized by negative surface wave group velocity anomalies as large as 6% in the period range from 15 s to 50 s. The spatial resolution of our data set (~300 km) makes it possible to study a specific area (centred at 61°S and 36°W) that includes Discovery Bank and appears to show dispersion characteristics similar to those found beneath the northern tip of the Antarctic Peninsula and southern South America. Surface wave dispersion curves are inverted to obtain 1-D isotropic shear wave velocity profiles that suggest a continental nature of Discovery Bank. Crustal thickness is in the range 23–28 km with a sub-Moho velocity of 4.1–4.2 km s-1. The boundaries of the negative group velocity anomalies are marked by a high level of seismic activity. The depth of the events and their large seismic moment suggest the presence of continental lithosphere. The continental-type crust of this topographic relief is supported by our interpretation of multichannel seismic reflection profiles acquired across this rise, where the observed seismic structures are interpreted as thinned and faulted continental plateau. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Scotia Sea Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) Herdman ENVELOPE(-60.526,-60.526,-72.655,-72.655) Discovery Bank ENVELOPE(72.833,72.833,-51.250,-51.250) Antarctic Science 17 1 97 106 |
institution |
Open Polar |
collection |
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
op_collection_id |
ftunitriestiris |
language |
English |
topic |
continental crust multichannel seismic profile South Scotia Ridge surface wave tomography |
spellingShingle |
continental crust multichannel seismic profile South Scotia Ridge surface wave tomography VUAN A. LODOLO E. SAULI C. PANZA, GIULIANO Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. |
topic_facet |
continental crust multichannel seismic profile South Scotia Ridge surface wave tomography |
description |
The Bruce, Discovery, Herdman and Jane banks, all located along the central-eastern part of the South Scotia Ridge, represent isolated topographic highs, surrounded by young oceanic crust (~5–23 Ma), whose petrological and structural nature is still the subject of speculation due to the lack of relevant data. Surface wave tomography in and around the Scotia Sea region, performed using eight broadband seismic stations and 300 events, shows that the central-eastern part of the South Scotia Ridge is characterized by negative surface wave group velocity anomalies as large as 6% in the period range from 15 s to 50 s. The spatial resolution of our data set (~300 km) makes it possible to study a specific area (centred at 61°S and 36°W) that includes Discovery Bank and appears to show dispersion characteristics similar to those found beneath the northern tip of the Antarctic Peninsula and southern South America. Surface wave dispersion curves are inverted to obtain 1-D isotropic shear wave velocity profiles that suggest a continental nature of Discovery Bank. Crustal thickness is in the range 23–28 km with a sub-Moho velocity of 4.1–4.2 km s-1. The boundaries of the negative group velocity anomalies are marked by a high level of seismic activity. The depth of the events and their large seismic moment suggest the presence of continental lithosphere. The continental-type crust of this topographic relief is supported by our interpretation of multichannel seismic reflection profiles acquired across this rise, where the observed seismic structures are interpreted as thinned and faulted continental plateau. |
author2 |
Vuan, A. Lodolo, E. Panza, Giuliano Sauli, C. |
format |
Article in Journal/Newspaper |
author |
VUAN A. LODOLO E. SAULI C. PANZA, GIULIANO |
author_facet |
VUAN A. LODOLO E. SAULI C. PANZA, GIULIANO |
author_sort |
VUAN A. |
title |
Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. |
title_short |
Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. |
title_full |
Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. |
title_fullStr |
Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. |
title_full_unstemmed |
Crustal structure beneath Discovery Bank in the Scotia Sea from group velocity tomography and seismic reflection data. |
title_sort |
crustal structure beneath discovery bank in the scotia sea from group velocity tomography and seismic reflection data. |
publishDate |
2005 |
url |
http://hdl.handle.net/11368/1698575 https://doi.org/10.1017/S0954102005002488 |
long_lat |
ENVELOPE(-46.500,-46.500,-60.000,-60.000) ENVELOPE(-60.526,-60.526,-72.655,-72.655) ENVELOPE(72.833,72.833,-51.250,-51.250) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Scotia Ridge Herdman Discovery Bank |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Scotia Ridge Herdman Discovery Bank |
genre |
Antarc* Antarctic Antarctic Peninsula Scotia Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Scotia Sea |
op_relation |
volume:17 firstpage:97 lastpage:106 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11368/1698575 doi:10.1017/S0954102005002488 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-15244359763 |
op_doi |
https://doi.org/10.1017/S0954102005002488 |
container_title |
Antarctic Science |
container_volume |
17 |
container_issue |
1 |
container_start_page |
97 |
op_container_end_page |
106 |
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1766015717129322496 |