"Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins.
Publisher's version (útgefin grein) Heitur reitur er landsvæði sem einkennist af mikilli eldvirkni og jarðhita og stendur hátt yfir umhverfið. Ísland er einn af stærstu heitu reitum jarðar og gnæfir 2-4 km yfir venjulega hæð Norður-Atlantshafshryggjarins sem gengur í gegnum landið. Markmið fjöl...
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Format: | Article in Journal/Newspaper |
Language: | Icelandic |
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Hið íslenska náttúrufræðifélag
1997
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Online Access: | https://hdl.handle.net/20.500.11815/1033 |
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ftopinvisindi:oai:opinvisindi.is:20.500.11815/1033 2023-05-15T16:43:47+02:00 "Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. Bjarnason, Ingi Þorleifur Raunvísindastofnun (HÍ) Science Institute (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland 1997 77-83 https://hdl.handle.net/20.500.11815/1033 is ice Hið íslenska náttúrufræðifélag Náttúrufræðingurinn;67(2) https://hdl.handle.net/20.500.11815/1033 Náttúrufræðingurinn info:eu-repo/semantics/openAccess Eldvirkni Jarðhiti Jarðeðlisfræði Jökulhlaup Jöklar Jarðmöttull Möttulstrókur Jarðskjálftar info:eu-repo/semantics/article 1997 ftopinvisindi https://doi.org/20.500.11815/1033 2022-11-18T06:51:43Z Publisher's version (útgefin grein) Heitur reitur er landsvæði sem einkennist af mikilli eldvirkni og jarðhita og stendur hátt yfir umhverfið. Ísland er einn af stærstu heitu reitum jarðar og gnæfir 2-4 km yfir venjulega hæð Norður-Atlantshafshryggjarins sem gengur í gegnum landið. Markmið fjölþjóðlega jarðskjálftaverkefnisins ÍSBRÁÐ (bráðin sem myndar Ísland) er að rannsaka þessa jarðfræðilegu uppsprettu landsins. (Ingi Þ. Bjarnason o.fl. 1996). Raunvísindastofnun leiðir þetta verkefni en samstarfsaðilar eru frá Bandaríkjunum, Bretlandi og ýmsum stofnunum hér á landi. An international geophysical project named ICEMELT (the melt that produces Iceland), is using means of seismology to illuminate the mantle under Iceland down to approximately 650 km depth to construct a model of the mantle plume under Iceland. The plume and its interaction with the Atlantic Ridge is the main source of the excessive volcanism in this region, and hence the source of the existence of lceland. The plume is imaged by analysing the effect it has on seismic waves, that are slowed down when they traverse the part of the mantle that is affected by the heat of the plume. For this task, data were collected continuously 1993-1996, with broadband seismometers, that are sensitive to earthquakes anywhere in the world. These measurements have confirmed a remarkably narrow plume with a diameter between 150-300 km at 100-400 km depth undir Iceland. The plume probably reaches down to at least 650 km depth, and its geographic center is under central Iceland and the western part of Vatnajökull, which is also the location of the most powerful volcanic systems in Iceland. Analysis of surface waves has revealed a large reduction (approx. 10%) in S-wave velocity at approximately 50 km depth in the mantle under central Iceland and along the volcanic zone north of Vatnajökull. This velocity reversal probably marks the upper extent of a partially molten asthenosphere, the melting region or oven where the materials that make Iceland are smelted. Seismic ... Article in Journal/Newspaper Iceland Vatnajökull Opin vísindi (Iceland) Vatnajökull ENVELOPE(-16.823,-16.823,64.420,64.420) |
institution |
Open Polar |
collection |
Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
language |
Icelandic |
topic |
Eldvirkni Jarðhiti Jarðeðlisfræði Jökulhlaup Jöklar Jarðmöttull Möttulstrókur Jarðskjálftar |
spellingShingle |
Eldvirkni Jarðhiti Jarðeðlisfræði Jökulhlaup Jöklar Jarðmöttull Möttulstrókur Jarðskjálftar Bjarnason, Ingi Þorleifur "Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. |
topic_facet |
Eldvirkni Jarðhiti Jarðeðlisfræði Jökulhlaup Jöklar Jarðmöttull Möttulstrókur Jarðskjálftar |
description |
Publisher's version (útgefin grein) Heitur reitur er landsvæði sem einkennist af mikilli eldvirkni og jarðhita og stendur hátt yfir umhverfið. Ísland er einn af stærstu heitu reitum jarðar og gnæfir 2-4 km yfir venjulega hæð Norður-Atlantshafshryggjarins sem gengur í gegnum landið. Markmið fjölþjóðlega jarðskjálftaverkefnisins ÍSBRÁÐ (bráðin sem myndar Ísland) er að rannsaka þessa jarðfræðilegu uppsprettu landsins. (Ingi Þ. Bjarnason o.fl. 1996). Raunvísindastofnun leiðir þetta verkefni en samstarfsaðilar eru frá Bandaríkjunum, Bretlandi og ýmsum stofnunum hér á landi. An international geophysical project named ICEMELT (the melt that produces Iceland), is using means of seismology to illuminate the mantle under Iceland down to approximately 650 km depth to construct a model of the mantle plume under Iceland. The plume and its interaction with the Atlantic Ridge is the main source of the excessive volcanism in this region, and hence the source of the existence of lceland. The plume is imaged by analysing the effect it has on seismic waves, that are slowed down when they traverse the part of the mantle that is affected by the heat of the plume. For this task, data were collected continuously 1993-1996, with broadband seismometers, that are sensitive to earthquakes anywhere in the world. These measurements have confirmed a remarkably narrow plume with a diameter between 150-300 km at 100-400 km depth undir Iceland. The plume probably reaches down to at least 650 km depth, and its geographic center is under central Iceland and the western part of Vatnajökull, which is also the location of the most powerful volcanic systems in Iceland. Analysis of surface waves has revealed a large reduction (approx. 10%) in S-wave velocity at approximately 50 km depth in the mantle under central Iceland and along the volcanic zone north of Vatnajökull. This velocity reversal probably marks the upper extent of a partially molten asthenosphere, the melting region or oven where the materials that make Iceland are smelted. Seismic ... |
author2 |
Raunvísindastofnun (HÍ) Science Institute (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland |
format |
Article in Journal/Newspaper |
author |
Bjarnason, Ingi Þorleifur |
author_facet |
Bjarnason, Ingi Þorleifur |
author_sort |
Bjarnason, Ingi Þorleifur |
title |
"Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. |
title_short |
"Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. |
title_full |
"Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. |
title_fullStr |
"Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. |
title_full_unstemmed |
"Eldhjarta Íslands": leitin að jarðfræðilegri uppsprettu landsins. |
title_sort |
"eldhjarta íslands": leitin að jarðfræðilegri uppsprettu landsins. |
publisher |
Hið íslenska náttúrufræðifélag |
publishDate |
1997 |
url |
https://hdl.handle.net/20.500.11815/1033 |
long_lat |
ENVELOPE(-16.823,-16.823,64.420,64.420) |
geographic |
Vatnajökull |
geographic_facet |
Vatnajökull |
genre |
Iceland Vatnajökull |
genre_facet |
Iceland Vatnajökull |
op_relation |
Náttúrufræðingurinn;67(2) https://hdl.handle.net/20.500.11815/1033 Náttúrufræðingurinn |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/1033 |
_version_ |
1766034119826866176 |