Multiple melt injection along a spreading segment at Askja, Iceland
Lower crustal earthquakes (12–25 km depth) have been detected since August 2005 in the Askja volcanic system along the north Iceland rift, in the normally ductile part of the crust. The earthquakes occur in three clusters, which have stable dimensions and locations through time and are interpreted a...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AGU
2011
|
Subjects: | |
Online Access: | http://eprints.esc.cam.ac.uk/1980/ http://eprints.esc.cam.ac.uk/1980/1/2010GL046264-pip.pdf http://eprints.esc.cam.ac.uk/1980/2/208_Key_et_al_GRL2011.pdf https://doi.org/10.1029/2010GL046264 |
id |
ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1980 |
---|---|
record_format |
openpolar |
spelling |
ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1980 2023-05-15T16:47:02+02:00 Multiple melt injection along a spreading segment at Askja, Iceland Key, J. White, R. S. Soosalu, H. Jakobsdottir, S. S. 2011-03 text http://eprints.esc.cam.ac.uk/1980/ http://eprints.esc.cam.ac.uk/1980/1/2010GL046264-pip.pdf http://eprints.esc.cam.ac.uk/1980/2/208_Key_et_al_GRL2011.pdf https://doi.org/10.1029/2010GL046264 en eng AGU http://eprints.esc.cam.ac.uk/1980/1/2010GL046264-pip.pdf http://eprints.esc.cam.ac.uk/1980/2/208_Key_et_al_GRL2011.pdf Key, J. and White, R. S. and Soosalu, H. and Jakobsdottir, S. S. (2011) Multiple melt injection along a spreading segment at Askja, Iceland. Geophysical Research Letters, 38. L05301. ISSN 0094–8276 DOI https://doi.org/10.1029/2010GL046264 <https://doi.org/10.1029/2010GL046264> cc_by_nc CC-BY-NC 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2011 ftucambridgeesc https://doi.org/10.1029/2010GL046264 2020-08-27T18:09:05Z Lower crustal earthquakes (12–25 km depth) have been detected since August 2005 in the Askja volcanic system along the north Iceland rift, in the normally ductile part of the crust. The earthquakes occur in three clusters, which have stable dimensions and locations through time and are interpreted as positions of repeated melt supply from the mantle to the lower crust. Seismic velocity Vp/Vs ratios are consistent with the presence of partial melt in the lower crust at Askja. The spatial separation of the clusters shows that there are multiple positions of melt injection within this one magmatic segment and all three positions are currently active. This pattern of melt supply is more like that observed on fast spreading ridges than slow spreading ridges and is probably a consequence of the increased melt production beneath Iceland compared to the rest of the Mid-Atlantic Ridge. However, the relative number of earthquakes in each cluster shows that two thirds of the melt is supplied to the central volcano Askja (i.e. segment center). During the last major rifting episode shallow lateral melt migration occurred from the magma chamber beneath the volcano. Therefore on long time scales melt supply is probably greater at the segment center, with melt redistribution in the upper crust, even though there are multiple points of lower crustal injection along the segment. Article in Journal/Newspaper Iceland University of Cambridge, Department of Earth Sciences: ESC Publications Askja ENVELOPE(-16.802,-16.802,65.042,65.042) Mid-Atlantic Ridge Geophysical Research Letters 38 5 n/a n/a |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
02 - Geodynamics Geophysics and Tectonics Key, J. White, R. S. Soosalu, H. Jakobsdottir, S. S. Multiple melt injection along a spreading segment at Askja, Iceland |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
Lower crustal earthquakes (12–25 km depth) have been detected since August 2005 in the Askja volcanic system along the north Iceland rift, in the normally ductile part of the crust. The earthquakes occur in three clusters, which have stable dimensions and locations through time and are interpreted as positions of repeated melt supply from the mantle to the lower crust. Seismic velocity Vp/Vs ratios are consistent with the presence of partial melt in the lower crust at Askja. The spatial separation of the clusters shows that there are multiple positions of melt injection within this one magmatic segment and all three positions are currently active. This pattern of melt supply is more like that observed on fast spreading ridges than slow spreading ridges and is probably a consequence of the increased melt production beneath Iceland compared to the rest of the Mid-Atlantic Ridge. However, the relative number of earthquakes in each cluster shows that two thirds of the melt is supplied to the central volcano Askja (i.e. segment center). During the last major rifting episode shallow lateral melt migration occurred from the magma chamber beneath the volcano. Therefore on long time scales melt supply is probably greater at the segment center, with melt redistribution in the upper crust, even though there are multiple points of lower crustal injection along the segment. |
format |
Article in Journal/Newspaper |
author |
Key, J. White, R. S. Soosalu, H. Jakobsdottir, S. S. |
author_facet |
Key, J. White, R. S. Soosalu, H. Jakobsdottir, S. S. |
author_sort |
Key, J. |
title |
Multiple melt injection along a spreading segment at Askja, Iceland |
title_short |
Multiple melt injection along a spreading segment at Askja, Iceland |
title_full |
Multiple melt injection along a spreading segment at Askja, Iceland |
title_fullStr |
Multiple melt injection along a spreading segment at Askja, Iceland |
title_full_unstemmed |
Multiple melt injection along a spreading segment at Askja, Iceland |
title_sort |
multiple melt injection along a spreading segment at askja, iceland |
publisher |
AGU |
publishDate |
2011 |
url |
http://eprints.esc.cam.ac.uk/1980/ http://eprints.esc.cam.ac.uk/1980/1/2010GL046264-pip.pdf http://eprints.esc.cam.ac.uk/1980/2/208_Key_et_al_GRL2011.pdf https://doi.org/10.1029/2010GL046264 |
long_lat |
ENVELOPE(-16.802,-16.802,65.042,65.042) |
geographic |
Askja Mid-Atlantic Ridge |
geographic_facet |
Askja Mid-Atlantic Ridge |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://eprints.esc.cam.ac.uk/1980/1/2010GL046264-pip.pdf http://eprints.esc.cam.ac.uk/1980/2/208_Key_et_al_GRL2011.pdf Key, J. and White, R. S. and Soosalu, H. and Jakobsdottir, S. S. (2011) Multiple melt injection along a spreading segment at Askja, Iceland. Geophysical Research Letters, 38. L05301. ISSN 0094–8276 DOI https://doi.org/10.1029/2010GL046264 <https://doi.org/10.1029/2010GL046264> |
op_rights |
cc_by_nc |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1029/2010GL046264 |
container_title |
Geophysical Research Letters |
container_volume |
38 |
container_issue |
5 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766037135817703424 |