Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica
The seismological observation of iceshocks was carried out at Mizuho Station (72°42'S, 44°20'E, 2230m a. s. l.), East Antarctica, during a period from May 1978 to January 1979. From the observation it was found that the condition of iceshock occurrence was expressed by a function of both t...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
National Institute of Polar Research
1981
|
Subjects: | |
Online Access: | https://doi.org/10.15094/00008269 https://doaj.org/article/2292338c0b324f14bc41a9050ed01c24 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:2292338c0b324f14bc41a9050ed01c24 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:2292338c0b324f14bc41a9050ed01c24 2023-05-15T13:43:15+02:00 Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica Kenji Ishizawa 1981-09-01 https://doi.org/10.15094/00008269 https://doaj.org/article/2292338c0b324f14bc41a9050ed01c24 en other eng National Institute of Polar Research doi:10.15094/00008269 0085-7289 2432-079X https://doaj.org/article/2292338c0b324f14bc41a9050ed01c24 undefined Antarctic Record, Iss 73, Pp 161-177 (1981) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1981 fttriple https://doi.org/10.15094/00008269 2023-01-22T19:11:57Z The seismological observation of iceshocks was carried out at Mizuho Station (72°42'S, 44°20'E, 2230m a. s. l.), East Antarctica, during a period from May 1978 to January 1979. From the observation it was found that the condition of iceshock occurrence was expressed by a function of both the air temperature and the changing rate of the temperature. The iceshock occurrence was explained by the fracture of the surface snow which was assumed to be a Maxwell substance. The focus positions of 45 iceshocks of a swarm were calculated by using the observed velocity of surface wave. This calculation was checked by the result of an artificial hitting on the snow surface and was found to be efficient for the determination of the focus position. The result of the calculation indicated that the focus positions were concentrated at the glazed surface where snow accumulation did not take place for a long time (for example, 2 or 3 years) and the fracture cracks were observed. Therefore, it is concluded that the iceshocks are defined as a vibration caused by the fracture crack formation at the glazed surface due to a rapid decrease in the air temperature. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet Unknown East Antarctica Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) Mizuho Station ENVELOPE(44.317,44.317,-70.683,-70.683) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Kenji Ishizawa Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica |
topic_facet |
geo envir |
description |
The seismological observation of iceshocks was carried out at Mizuho Station (72°42'S, 44°20'E, 2230m a. s. l.), East Antarctica, during a period from May 1978 to January 1979. From the observation it was found that the condition of iceshock occurrence was expressed by a function of both the air temperature and the changing rate of the temperature. The iceshock occurrence was explained by the fracture of the surface snow which was assumed to be a Maxwell substance. The focus positions of 45 iceshocks of a swarm were calculated by using the observed velocity of surface wave. This calculation was checked by the result of an artificial hitting on the snow surface and was found to be efficient for the determination of the focus position. The result of the calculation indicated that the focus positions were concentrated at the glazed surface where snow accumulation did not take place for a long time (for example, 2 or 3 years) and the fracture cracks were observed. Therefore, it is concluded that the iceshocks are defined as a vibration caused by the fracture crack formation at the glazed surface due to a rapid decrease in the air temperature. |
format |
Article in Journal/Newspaper |
author |
Kenji Ishizawa |
author_facet |
Kenji Ishizawa |
author_sort |
Kenji Ishizawa |
title |
Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica |
title_short |
Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica |
title_full |
Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica |
title_fullStr |
Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica |
title_full_unstemmed |
Iceshocks observed at the ice sheet surface near Mizuho Station, East Antarctica |
title_sort |
iceshocks observed at the ice sheet surface near mizuho station, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1981 |
url |
https://doi.org/10.15094/00008269 https://doaj.org/article/2292338c0b324f14bc41a9050ed01c24 |
long_lat |
ENVELOPE(44.317,44.317,-70.683,-70.683) ENVELOPE(44.317,44.317,-70.683,-70.683) |
geographic |
East Antarctica Mizuho Mizuho Station |
geographic_facet |
East Antarctica Mizuho Mizuho Station |
genre |
Antarc* Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet |
op_source |
Antarctic Record, Iss 73, Pp 161-177 (1981) |
op_relation |
doi:10.15094/00008269 0085-7289 2432-079X https://doaj.org/article/2292338c0b324f14bc41a9050ed01c24 |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00008269 |
_version_ |
1766186373335744512 |