Diurnal seismicity cycle linked to subsurface melting on an ice shelf ...
ABSTRACTSeismograms acquired on the McMurdo Ice Shelf, Antarctica, during an Austral summer melt season (November 2016–January 2017) reveal a diurnal cycle of seismicity, consisting of hundreds of thousands of small ice quakes limited to a 6–12 hour period during the evening, in an area where there...
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ftdatacite:10.17863/cam.33824 2024-02-04T09:56:03+01:00 Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... Macayeal, DR Banwell, AF Okal, EA Lin, J Willis, IC Goodsell, B Macdonald, GJ 2019 https://dx.doi.org/10.17863/cam.33824 https://www.repository.cam.ac.uk/handle/1810/286514 en eng Cambridge University Press (CUP) Antarctic glaciology debris-covered glaciers ice shelves ice temperature seismics Article ScholarlyArticle JournalArticle article-journal 2019 ftdatacite https://doi.org/10.17863/cam.33824 2024-01-05T14:56:35Z ABSTRACTSeismograms acquired on the McMurdo Ice Shelf, Antarctica, during an Austral summer melt season (November 2016–January 2017) reveal a diurnal cycle of seismicity, consisting of hundreds of thousands of small ice quakes limited to a 6–12 hour period during the evening, in an area where there is substantial subsurface melting. This cycle is explained by thermally induced bending and fracture of a frozen surface superimposed on a subsurface slush/water layer that is supported by solar radiation penetration and absorption. A simple, one-dimensional model of heat transfer driven by observed surface air temperature and shortwave absorption reproduces the presence and absence (as daily weather dictated) of the observed diurnal seismicity cycle. Seismic event statistics comparing event occurrence with amplitude suggest that the events are generated in a fractured medium featuring relatively low stresses, as is consistent with a frozen surface superimposed on subsurface slush. Waveforms of the icequakes are ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf DataCite Metadata Store (German National Library of Science and Technology) Antarctic Austral McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Antarctic glaciology debris-covered glaciers ice shelves ice temperature seismics |
spellingShingle |
Antarctic glaciology debris-covered glaciers ice shelves ice temperature seismics Macayeal, DR Banwell, AF Okal, EA Lin, J Willis, IC Goodsell, B Macdonald, GJ Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
topic_facet |
Antarctic glaciology debris-covered glaciers ice shelves ice temperature seismics |
description |
ABSTRACTSeismograms acquired on the McMurdo Ice Shelf, Antarctica, during an Austral summer melt season (November 2016–January 2017) reveal a diurnal cycle of seismicity, consisting of hundreds of thousands of small ice quakes limited to a 6–12 hour period during the evening, in an area where there is substantial subsurface melting. This cycle is explained by thermally induced bending and fracture of a frozen surface superimposed on a subsurface slush/water layer that is supported by solar radiation penetration and absorption. A simple, one-dimensional model of heat transfer driven by observed surface air temperature and shortwave absorption reproduces the presence and absence (as daily weather dictated) of the observed diurnal seismicity cycle. Seismic event statistics comparing event occurrence with amplitude suggest that the events are generated in a fractured medium featuring relatively low stresses, as is consistent with a frozen surface superimposed on subsurface slush. Waveforms of the icequakes are ... |
format |
Article in Journal/Newspaper |
author |
Macayeal, DR Banwell, AF Okal, EA Lin, J Willis, IC Goodsell, B Macdonald, GJ |
author_facet |
Macayeal, DR Banwell, AF Okal, EA Lin, J Willis, IC Goodsell, B Macdonald, GJ |
author_sort |
Macayeal, DR |
title |
Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
title_short |
Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
title_full |
Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
title_fullStr |
Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
title_full_unstemmed |
Diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
title_sort |
diurnal seismicity cycle linked to subsurface melting on an ice shelf ... |
publisher |
Cambridge University Press (CUP) |
publishDate |
2019 |
url |
https://dx.doi.org/10.17863/cam.33824 https://www.repository.cam.ac.uk/handle/1810/286514 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
Antarctic Austral McMurdo Ice Shelf |
geographic_facet |
Antarctic Austral McMurdo Ice Shelf |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf |
op_doi |
https://doi.org/10.17863/cam.33824 |
_version_ |
1789960399560376320 |