Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract)
P(論文) A refraction experiment with a 100kg charge was carried out on the ice sheet of the Prince Olav Coast, East Antarctica by the 21st Japanese Antarctic Research Expedition (JARE) in 1980. Prominent Rayleigh waves were clearly recorded in a distance range of 2 to 8km from the explosion point. The...
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ftnipr:oai:nipr.repo.nii.ac.jp:00001463 2024-09-09T19:04:17+00:00 Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) Ikami, Akira Kaminuma, Katsutada 1983-10 application/pdf https://nipr.repo.nii.ac.jp/record/1463/files/KJ00000012096.pdf eng eng Memoirs of National Institute of Polar Research. Special issue 28 45 AA00733561 https://nipr.repo.nii.ac.jp/record/1463/files/KJ00000012096.pdf 1983 ftnipr 2024-06-17T04:00:39Z P(論文) A refraction experiment with a 100kg charge was carried out on the ice sheet of the Prince Olav Coast, East Antarctica by the 21st Japanese Antarctic Research Expedition (JARE) in 1980. Prominent Rayleigh waves were clearly recorded in a distance range of 2 to 8km from the explosion point. The maximum period of Rayleigh waves was 0.7s with a phase velocity of 1.8km/s. A phase velocity of surface waves is considered to be most sensitive to the P- and S-wave velocity structures of ice layers to a depth of one-fourth of the wave length. Since the longest wave length of Rayleigh waves in the present experiment is estimated to be 1300m for the maximum period of 0.7s (1.8km/s in phase velocity), P-aand S-waves velocity structures of ice layers to a depth of 300 to 400m may be inferred from the dispersion curves. Assuming velocity structures of ice sheet in the Mizuho Plateau based on the previous works of JARE, theoretical dispersion curves were calculated for three different velocity structures and they were compared with the observed ones. For example, the calculated phase velocities at the period of 0.4s were 1.85km/s for the highest velocity model, 1.7km/s for the middle and 1.6km/s for the lowest one and the observed phase velocity at the period of 0.4s was 1.75km/s. The velocity structure of P-aand S-waves in the upper part of ice sheet estimated from observed dispersion curves of Rayleigh waves is three percents higher than those of the averaged one in the Mizuho Plateau. The P-aand S-wave velocities from 100 to 1000m in depth range from 3.7 to 4.0km/s and from 1.8 to 2.0km/s. departmental bulletin paper Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica Ice Sheet Memoirs of National Institute of Polar Research Polar Research Prince Olav Coast National Institute of Polar Research Repository, Japan Antarctic East Antarctica Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) Mizuho Plateau ENVELOPE(40.000,40.000,-73.000,-73.000) Prince Olav Coast ENVELOPE(41.000,41.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
P(論文) A refraction experiment with a 100kg charge was carried out on the ice sheet of the Prince Olav Coast, East Antarctica by the 21st Japanese Antarctic Research Expedition (JARE) in 1980. Prominent Rayleigh waves were clearly recorded in a distance range of 2 to 8km from the explosion point. The maximum period of Rayleigh waves was 0.7s with a phase velocity of 1.8km/s. A phase velocity of surface waves is considered to be most sensitive to the P- and S-wave velocity structures of ice layers to a depth of one-fourth of the wave length. Since the longest wave length of Rayleigh waves in the present experiment is estimated to be 1300m for the maximum period of 0.7s (1.8km/s in phase velocity), P-aand S-waves velocity structures of ice layers to a depth of 300 to 400m may be inferred from the dispersion curves. Assuming velocity structures of ice sheet in the Mizuho Plateau based on the previous works of JARE, theoretical dispersion curves were calculated for three different velocity structures and they were compared with the observed ones. For example, the calculated phase velocities at the period of 0.4s were 1.85km/s for the highest velocity model, 1.7km/s for the middle and 1.6km/s for the lowest one and the observed phase velocity at the period of 0.4s was 1.75km/s. The velocity structure of P-aand S-waves in the upper part of ice sheet estimated from observed dispersion curves of Rayleigh waves is three percents higher than those of the averaged one in the Mizuho Plateau. The P-aand S-wave velocities from 100 to 1000m in depth range from 3.7 to 4.0km/s and from 1.8 to 2.0km/s. departmental bulletin paper |
author |
Ikami, Akira Kaminuma, Katsutada |
spellingShingle |
Ikami, Akira Kaminuma, Katsutada Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) |
author_facet |
Ikami, Akira Kaminuma, Katsutada |
author_sort |
Ikami, Akira |
title |
Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) |
title_short |
Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) |
title_full |
Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) |
title_fullStr |
Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) |
title_full_unstemmed |
Phase velocity of Rayleigh waves generated by seismic explosions in Prince Olav Coast, East Antarctica (abstract) |
title_sort |
phase velocity of rayleigh waves generated by seismic explosions in prince olav coast, east antarctica (abstract) |
publishDate |
1983 |
url |
https://nipr.repo.nii.ac.jp/record/1463/files/KJ00000012096.pdf |
long_lat |
ENVELOPE(44.317,44.317,-70.683,-70.683) ENVELOPE(40.000,40.000,-73.000,-73.000) ENVELOPE(41.000,41.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica Mizuho Mizuho Plateau Prince Olav Coast |
geographic_facet |
Antarctic East Antarctica Mizuho Mizuho Plateau Prince Olav Coast |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Memoirs of National Institute of Polar Research Polar Research Prince Olav Coast |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Memoirs of National Institute of Polar Research Polar Research Prince Olav Coast |
op_relation |
Memoirs of National Institute of Polar Research. Special issue 28 45 AA00733561 https://nipr.repo.nii.ac.jp/record/1463/files/KJ00000012096.pdf |
_version_ |
1809818287656140800 |