Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations
International audience Structural features of volcanic and hydrothermal systems can be used to infer the location of magma chambers or productive geothermal areas. The Hengill volcanic triple-junction complex has a well-developed geothermal system, which is being exploited to extract hot fluids that...
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Online Access: | https://brgm.hal.science/hal-00562003 https://brgm.hal.science/hal-00562003/document https://brgm.hal.science/hal-00562003/file/Joussetetal_Hengill_ACCEPTED.pdf https://doi.org/10.1016/j.geothermics.2010.12.008 |
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ftbrgm:oai:HAL:hal-00562003v1 2024-05-19T07:42:56+00:00 Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations Jousset, Philippe Haberland, Christian Bauer, Klaus Arnasson, Knutur Bureau de Recherches Géologiques et Minières (BRGM) German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) Iceland GeoSurvey (ISOR ) FP7-IGET-Engine FP7-IGET 2011 https://brgm.hal.science/hal-00562003 https://brgm.hal.science/hal-00562003/document https://brgm.hal.science/hal-00562003/file/Joussetetal_Hengill_ACCEPTED.pdf https://doi.org/10.1016/j.geothermics.2010.12.008 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geothermics.2010.12.008 hal-00562003 https://brgm.hal.science/hal-00562003 https://brgm.hal.science/hal-00562003/document https://brgm.hal.science/hal-00562003/file/Joussetetal_Hengill_ACCEPTED.pdf doi:10.1016/j.geothermics.2010.12.008 info:eu-repo/semantics/OpenAccess ISSN: 0375-6505 Geothermics https://brgm.hal.science/hal-00562003 Geothermics, 2011, 40 (1), pp.1-24. ⟨10.1016/j.geothermics.2010.12.008⟩ Hengill volcano integrated geophysics broadband seismology seismic tomography resistivity fluids [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2011 ftbrgm https://doi.org/10.1016/j.geothermics.2010.12.008 2024-05-02T00:05:30Z International audience Structural features of volcanic and hydrothermal systems can be used to infer the location of magma chambers or productive geothermal areas. The Hengill volcanic triple-junction complex has a well-developed geothermal system, which is being exploited to extract hot fluids that are used for electrical power and heat production. In the framework of the I-GET project, a 4- month temporary seismological network including seven highdynamic broadband instruments was deployed and 1D transient electromagnetic soundings (TEM) and 3D magnetotelluric (MT) surveys were performed to improve understanding of the relationships between structural features, seismic activity and fluid production at the Hengill geothermal system. The MT and TEM data set is analyzed elsewhere. The analysis of the seismological data set allowed the detection and classification of more than 600 earthquakes, among which long-period (LP) earthquakes were observed for the first time in this area. This work focuses first on a joint inversion for the 3D velocity structure and determination of the locations of the hypocentres from about 250 local volcano-tectonic earthquakes with clear Pand S- wave arrival times. The results confirm those from earlier tomography studies in this area. Integrating the seismic velocity and resistivity models in a semi-quantitative approach by crossplotting the resistivity model with the velocity ratio VP/VS delineates a structural body with a high seismic velocity ratio and low resistivity that is interpreted as the main heat source of the geothermal system. Article in Journal/Newspaper Iceland BRGM: HAL (Bureau de Recherches Géologiques et Minières) Geothermics 40 1 1 24 |
institution |
Open Polar |
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BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
Hengill volcano integrated geophysics broadband seismology seismic tomography resistivity fluids [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Hengill volcano integrated geophysics broadband seismology seismic tomography resistivity fluids [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes Jousset, Philippe Haberland, Christian Bauer, Klaus Arnasson, Knutur Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations |
topic_facet |
Hengill volcano integrated geophysics broadband seismology seismic tomography resistivity fluids [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Structural features of volcanic and hydrothermal systems can be used to infer the location of magma chambers or productive geothermal areas. The Hengill volcanic triple-junction complex has a well-developed geothermal system, which is being exploited to extract hot fluids that are used for electrical power and heat production. In the framework of the I-GET project, a 4- month temporary seismological network including seven highdynamic broadband instruments was deployed and 1D transient electromagnetic soundings (TEM) and 3D magnetotelluric (MT) surveys were performed to improve understanding of the relationships between structural features, seismic activity and fluid production at the Hengill geothermal system. The MT and TEM data set is analyzed elsewhere. The analysis of the seismological data set allowed the detection and classification of more than 600 earthquakes, among which long-period (LP) earthquakes were observed for the first time in this area. This work focuses first on a joint inversion for the 3D velocity structure and determination of the locations of the hypocentres from about 250 local volcano-tectonic earthquakes with clear Pand S- wave arrival times. The results confirm those from earlier tomography studies in this area. Integrating the seismic velocity and resistivity models in a semi-quantitative approach by crossplotting the resistivity model with the velocity ratio VP/VS delineates a structural body with a high seismic velocity ratio and low resistivity that is interpreted as the main heat source of the geothermal system. |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) Iceland GeoSurvey (ISOR ) FP7-IGET-Engine FP7-IGET |
format |
Article in Journal/Newspaper |
author |
Jousset, Philippe Haberland, Christian Bauer, Klaus Arnasson, Knutur |
author_facet |
Jousset, Philippe Haberland, Christian Bauer, Klaus Arnasson, Knutur |
author_sort |
Jousset, Philippe |
title |
Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations |
title_short |
Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations |
title_full |
Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations |
title_fullStr |
Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations |
title_full_unstemmed |
Hengill geothermal volcanic complex (Iceland) characterized by integrated geophysical observations |
title_sort |
hengill geothermal volcanic complex (iceland) characterized by integrated geophysical observations |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://brgm.hal.science/hal-00562003 https://brgm.hal.science/hal-00562003/document https://brgm.hal.science/hal-00562003/file/Joussetetal_Hengill_ACCEPTED.pdf https://doi.org/10.1016/j.geothermics.2010.12.008 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0375-6505 Geothermics https://brgm.hal.science/hal-00562003 Geothermics, 2011, 40 (1), pp.1-24. ⟨10.1016/j.geothermics.2010.12.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geothermics.2010.12.008 hal-00562003 https://brgm.hal.science/hal-00562003 https://brgm.hal.science/hal-00562003/document https://brgm.hal.science/hal-00562003/file/Joussetetal_Hengill_ACCEPTED.pdf doi:10.1016/j.geothermics.2010.12.008 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.geothermics.2010.12.008 |
container_title |
Geothermics |
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40 |
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1 |
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24 |
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