Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica
A reflective lower crust' has been found in some regions of Phanerozoic orogens. In Antarctica it has not been surveyed and is an important target for explosion experiments. Seismic refraction data from the explosion experiments during the 21st Japanese Antarctic Research Expedition (JARE-21) i...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:40a62c7c313e4385a15816aa1a13811a 2023-05-15T13:35:08+02:00 Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica Kiyoshi ITO Masaki KANAO 1995-11-01T00:00:00Z https://doi.org/10.15094/00008903 https://doaj.org/article/40a62c7c313e4385a15816aa1a13811a EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00008903 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008903 0085-7289 2432-079X https://doaj.org/article/40a62c7c313e4385a15816aa1a13811a Antarctic Record, Vol 39, Iss 3, Pp 233-242 (1995) Geography (General) G1-922 article 1995 ftdoajarticles https://doi.org/10.15094/00008903 2022-12-31T00:56:15Z A reflective lower crust' has been found in some regions of Phanerozoic orogens. In Antarctica it has not been surveyed and is an important target for explosion experiments. Seismic refraction data from the explosion experiments during the 21st Japanese Antarctic Research Expedition (JARE-21) in 1981 were re-analyzed to detect reflected waves from the lower crust. An explosion in Lutzow-Holm Bay with 3000kg of explosive gave well-recorded seismic waves at 27 stations along a 300km profile on the northern Mizuho Plateau, East Antarctica. A band-pass filtered record section with a normal-moveout velocity of 6.3km/s shows clear phases of large amplitudes in a range of 8-16s of two-way travel time; these phases can be considered as wide-angle reflected waves from the lower crust. The reflection depths correspond to about 18-48km. The depth patterns of reflective layers on the Mizuho Plateau can be related to the Bouguer gravity anomalies and are useful for studying the evolution of the Lutzow-Holm Complex. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) Mizuho Plateau ENVELOPE(40.000,40.000,-73.000,-73.000) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Kiyoshi ITO Masaki KANAO Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
A reflective lower crust' has been found in some regions of Phanerozoic orogens. In Antarctica it has not been surveyed and is an important target for explosion experiments. Seismic refraction data from the explosion experiments during the 21st Japanese Antarctic Research Expedition (JARE-21) in 1981 were re-analyzed to detect reflected waves from the lower crust. An explosion in Lutzow-Holm Bay with 3000kg of explosive gave well-recorded seismic waves at 27 stations along a 300km profile on the northern Mizuho Plateau, East Antarctica. A band-pass filtered record section with a normal-moveout velocity of 6.3km/s shows clear phases of large amplitudes in a range of 8-16s of two-way travel time; these phases can be considered as wide-angle reflected waves from the lower crust. The reflection depths correspond to about 18-48km. The depth patterns of reflective layers on the Mizuho Plateau can be related to the Bouguer gravity anomalies and are useful for studying the evolution of the Lutzow-Holm Complex. |
format |
Article in Journal/Newspaper |
author |
Kiyoshi ITO Masaki KANAO |
author_facet |
Kiyoshi ITO Masaki KANAO |
author_sort |
Kiyoshi ITO |
title |
Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica |
title_short |
Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica |
title_full |
Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica |
title_fullStr |
Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica |
title_full_unstemmed |
Detection of Reflected Waves from the Lower Crust on Mizuho Plateau, East Antarctica |
title_sort |
detection of reflected waves from the lower crust on mizuho plateau, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1995 |
url |
https://doi.org/10.15094/00008903 https://doaj.org/article/40a62c7c313e4385a15816aa1a13811a |
long_lat |
ENVELOPE(44.317,44.317,-70.683,-70.683) ENVELOPE(40.000,40.000,-73.000,-73.000) |
geographic |
Antarctic East Antarctica Mizuho Mizuho Plateau |
geographic_facet |
Antarctic East Antarctica Mizuho Mizuho Plateau |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_source |
Antarctic Record, Vol 39, Iss 3, Pp 233-242 (1995) |
op_relation |
http://doi.org/10.15094/00008903 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008903 0085-7289 2432-079X https://doaj.org/article/40a62c7c313e4385a15816aa1a13811a |
op_doi |
https://doi.org/10.15094/00008903 |
_version_ |
1766061361552424960 |