Interpretations of geoid anomalies around the Iceland hotspot
Geoid height anomalies around the Iceland hotspot in an area extending between 50°W to 14°E and 45°N to 72°N have been investigated to search for evidence of an upper mantle thermal anomaly. After removing wavelengths longer than 3800 km, the effect of the cooling lithosphere was eliminated by low-p...
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1991
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fthighwire:oai:open-archive.highwire.org:gji:106/1/149 2023-05-15T16:29:05+02:00 Interpretations of geoid anomalies around the Iceland hotspot Marquart, G. 1991-07-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/106/1/149 https://doi.org/10.1111/j.1365-246X.1991.tb04608.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/106/1/149 http://dx.doi.org/10.1111/j.1365-246X.1991.tb04608.x Copyright (C) 1991, Oxford University Press Articles TEXT 1991 fthighwire https://doi.org/10.1111/j.1365-246X.1991.tb04608.x 2015-02-28T18:14:26Z Geoid height anomalies around the Iceland hotspot in an area extending between 50°W to 14°E and 45°N to 72°N have been investigated to search for evidence of an upper mantle thermal anomaly. After removing wavelengths longer than 3800 km, the effect of the cooling lithosphere was eliminated by low-pass filtering of age data and applying the boundary model. The effects of the various platforms and swells in the North Atlantic were removed by an Airy model, since the geoid-to-topography ratio is lower than 1.5 m km-1 for all areas of elevated topography independent of their origin. The residual geoid shows a large positive anomaly with a steep constant slope towards a location (north)west of Iceland beneath Greenland. The amplitude of the anomaly can be estimated to at least 8 m. The geoid-to-topography ratio reaches a value of 7 m km-1 which is in good agreement with a plume-related anomaly. Text Greenland Iceland North Atlantic HighWire Press (Stanford University) Greenland Geophysical Journal International 106 1 149 160 |
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HighWire Press (Stanford University) |
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English |
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Articles |
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Articles Marquart, G. Interpretations of geoid anomalies around the Iceland hotspot |
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Articles |
description |
Geoid height anomalies around the Iceland hotspot in an area extending between 50°W to 14°E and 45°N to 72°N have been investigated to search for evidence of an upper mantle thermal anomaly. After removing wavelengths longer than 3800 km, the effect of the cooling lithosphere was eliminated by low-pass filtering of age data and applying the boundary model. The effects of the various platforms and swells in the North Atlantic were removed by an Airy model, since the geoid-to-topography ratio is lower than 1.5 m km-1 for all areas of elevated topography independent of their origin. The residual geoid shows a large positive anomaly with a steep constant slope towards a location (north)west of Iceland beneath Greenland. The amplitude of the anomaly can be estimated to at least 8 m. The geoid-to-topography ratio reaches a value of 7 m km-1 which is in good agreement with a plume-related anomaly. |
format |
Text |
author |
Marquart, G. |
author_facet |
Marquart, G. |
author_sort |
Marquart, G. |
title |
Interpretations of geoid anomalies around the Iceland hotspot |
title_short |
Interpretations of geoid anomalies around the Iceland hotspot |
title_full |
Interpretations of geoid anomalies around the Iceland hotspot |
title_fullStr |
Interpretations of geoid anomalies around the Iceland hotspot |
title_full_unstemmed |
Interpretations of geoid anomalies around the Iceland hotspot |
title_sort |
interpretations of geoid anomalies around the iceland hotspot |
publisher |
Oxford University Press |
publishDate |
1991 |
url |
http://gji.oxfordjournals.org/cgi/content/short/106/1/149 https://doi.org/10.1111/j.1365-246X.1991.tb04608.x |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/106/1/149 http://dx.doi.org/10.1111/j.1365-246X.1991.tb04608.x |
op_rights |
Copyright (C) 1991, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1991.tb04608.x |
container_title |
Geophysical Journal International |
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106 |
container_issue |
1 |
container_start_page |
149 |
op_container_end_page |
160 |
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1766018766108360704 |