Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur
From June 1978 until late 1980 radon emission from the Leirhnjukur fumaroles was monitored within the Krafla caldera of north Iceland where episodic volcanism is occurring. Frequent sampling of the fumaroles shows that no easily identifiable short-term radon precursors occur in the days prior to sub...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
1981
|
Subjects: | |
Online Access: | https://doi.org/10.1029/JB086iB12p11806 |
id |
ftcaltechauth:oai:authors.library.caltech.edu:qgcm6-4rq71 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:qgcm6-4rq71 2024-06-23T07:53:56+00:00 Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur Hauksson, Egill 1981-12 https://doi.org/10.1029/JB086iB12p11806 unknown American Geophysical Union https://doi.org/10.1029/JB086iB12p11806 oai:authors.library.caltech.edu:qgcm6-4rq71 eprintid:38333 resolverid:CaltechAUTHORS:20130507-144848497 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research B, 86(B12), 11806-11814, (1981-12) info:eu-repo/semantics/article 1981 ftcaltechauth https://doi.org/10.1029/JB086iB12p11806 2024-06-12T02:32:29Z From June 1978 until late 1980 radon emission from the Leirhnjukur fumaroles was monitored within the Krafla caldera of north Iceland where episodic volcanism is occurring. Frequent sampling of the fumaroles shows that no easily identifiable short-term radon precursors occur in the days prior to subsidence of the caldera, despite an observed increase in microseismicity preceding deflation. Following the onset of subsidence, however, the radon emission of the fumaroles gradually increases and reaches a maximum 3–6 days later. The radon in the fumaroles is assumed to be transported from depth by steam and noncondensing gases that slowly escape from the geothermal water table. The cause of the co-episodic increase in radon emission appears to be a temporal rise of the water table driven by fissure closure resulting in an abbreviated transport time for radon to the surface fumaroles. Furthermore, the closing of the fissures appears to cause a transient increase in the velocity of transport, making the shape of the anomalies broader and higher than is predicted from a change in the water level alone. Changes in radon emission also coincide with fluctuations in fumarolic activity and permanent changes in the level of geothermal water that occur during periods of uplift. © 1981 by the American Geophysical Union. Received April 4, 1981; revised July 24, 1981; accepted October 2, 1981. The author is indebted to the following colleagues, who kindly made unpublished data available for this study: P. Einarsson at Science Institute, University of Iceland, provided the earthquake data. A. Bjornsson and V. Stefansson at the National Energy Authority of Iceland provided the land elevation and the water level data. H. Tryggvason, also at the National Energy Authority, provided the data on the fumaroles and also collected the radon samples, often under difficult weather conditions. Valuable assistance from participants in the LDGO-Iceland radon project, J. G. Goddard, G. Aradottir, and S. E. Palsson is appreciated. The ... Article in Journal/Newspaper Iceland Caltech Authors (California Institute of Technology) Krafla ENVELOPE(-16.747,-16.747,65.713,65.713) Stefansson ENVELOPE(-62.417,-62.417,-69.467,-69.467) Journal of Geophysical Research: Solid Earth 86 B12 11806 11814 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
description |
From June 1978 until late 1980 radon emission from the Leirhnjukur fumaroles was monitored within the Krafla caldera of north Iceland where episodic volcanism is occurring. Frequent sampling of the fumaroles shows that no easily identifiable short-term radon precursors occur in the days prior to subsidence of the caldera, despite an observed increase in microseismicity preceding deflation. Following the onset of subsidence, however, the radon emission of the fumaroles gradually increases and reaches a maximum 3–6 days later. The radon in the fumaroles is assumed to be transported from depth by steam and noncondensing gases that slowly escape from the geothermal water table. The cause of the co-episodic increase in radon emission appears to be a temporal rise of the water table driven by fissure closure resulting in an abbreviated transport time for radon to the surface fumaroles. Furthermore, the closing of the fissures appears to cause a transient increase in the velocity of transport, making the shape of the anomalies broader and higher than is predicted from a change in the water level alone. Changes in radon emission also coincide with fluctuations in fumarolic activity and permanent changes in the level of geothermal water that occur during periods of uplift. © 1981 by the American Geophysical Union. Received April 4, 1981; revised July 24, 1981; accepted October 2, 1981. The author is indebted to the following colleagues, who kindly made unpublished data available for this study: P. Einarsson at Science Institute, University of Iceland, provided the earthquake data. A. Bjornsson and V. Stefansson at the National Energy Authority of Iceland provided the land elevation and the water level data. H. Tryggvason, also at the National Energy Authority, provided the data on the fumaroles and also collected the radon samples, often under difficult weather conditions. Valuable assistance from participants in the LDGO-Iceland radon project, J. G. Goddard, G. Aradottir, and S. E. Palsson is appreciated. The ... |
format |
Article in Journal/Newspaper |
author |
Hauksson, Egill |
spellingShingle |
Hauksson, Egill Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur |
author_facet |
Hauksson, Egill |
author_sort |
Hauksson, Egill |
title |
Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur |
title_short |
Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur |
title_full |
Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur |
title_fullStr |
Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur |
title_full_unstemmed |
Episodic rifting and volcanism at Krafla in north Iceland: Radon (222) emission from fumaroles near Leirhnjukur |
title_sort |
episodic rifting and volcanism at krafla in north iceland: radon (222) emission from fumaroles near leirhnjukur |
publisher |
American Geophysical Union |
publishDate |
1981 |
url |
https://doi.org/10.1029/JB086iB12p11806 |
long_lat |
ENVELOPE(-16.747,-16.747,65.713,65.713) ENVELOPE(-62.417,-62.417,-69.467,-69.467) |
geographic |
Krafla Stefansson |
geographic_facet |
Krafla Stefansson |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Journal of Geophysical Research B, 86(B12), 11806-11814, (1981-12) |
op_relation |
https://doi.org/10.1029/JB086iB12p11806 oai:authors.library.caltech.edu:qgcm6-4rq71 eprintid:38333 resolverid:CaltechAUTHORS:20130507-144848497 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/JB086iB12p11806 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
86 |
container_issue |
B12 |
container_start_page |
11806 |
op_container_end_page |
11814 |
_version_ |
1802645831074971648 |