3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)
Lydie Gailler
(1)
,
Jim Kauahikaua
(2)
,
Jean-François Lénat
(1)
,
André Revil
(3)
,
Marceau Gresse
(3)
,
Abdellahi Soueid Ahmed
(3)
,
Nicolas Cluzel
(1)
,
Geeth Manthilake
(1)
,
Lucia Gurioli
(1)
,
Tim Johnson
(4)
,
Anthony Finizola
(5)
,
Eric Delcher
(5)
Lydie Gailler
- Fonction : Auteur
- PersonId : 1125086
- IdHAL : lydiegailler
- ORCID : 0000-0002-8132-2428
André Revil
- Fonction : Auteur
- PersonId : 747567
- IdHAL : andre-revil
- ORCID : 0000-0001-7979-7005
Nicolas Cluzel
- Fonction : Auteur
- PersonId : 170295
- IdHAL : nicolas-cluzel
- ORCID : 0000-0002-2171-8789
- IdRef : 11639238X
Geeth Manthilake
- Fonction : Auteur
- PersonId : 739158
- IdHAL : manthilake
- ORCID : 0000-0001-8161-081X
- IdRef : 231453841
Lucia Gurioli
- Fonction : Auteur
- PersonId : 22120
- IdHAL : lucia-gurioli
- ORCID : 0000-0002-5066-5153
- IdRef : 175659346
Anthony Finizola
- Fonction : Auteur
- PersonId : 8354
- IdHAL : anthonyfinizola
- ORCID : 0000-0002-5083-7349
- IdRef : 071464840
Eric Delcher
- Fonction : Auteur
- PersonId : 12617
- IdHAL : eric-delcher
- ORCID : 0000-0001-6671-7133
- IdRef : 168574403
Résumé
Before the 2018 collapse of the summit of Kīlauea volcano, a ca. 200 m in diameter lava lake inside of Halema'uma'u crater was embedded in a very active hydrothermal system. In 2015, we carried out an electrical conductivity survey and the data were inverted in 3D. The lack of conductivity contrast precludes distinguishing the lava column from the surrounding hydrothermal zones. Laboratory measurements on samples from the lava lake show that the conductivity of magma is significantly lower than that of hydrothermal zones but the high ve-sicularity of the upper part of the lava lake may decrease its macroscopic conductivity. Based on the 3D conductivity model, we distinguish at least two types of hydrothermal circulations: 1) one guided by the collapse faults of Halema'uma'u crater and by the magmatic column of the lava lake, and 2) another guided by previous caldera faults and fractures related to intrusions. We observe that the location of the faults formed during the 2018 collapse of the summit was greatly influenced by the hydrothermally altered zones.
Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)
|
Résumé |
en
Before the 2018 collapse of the summit of Kīlauea volcano, a ca. 200 m in diameter lava lake inside of Halema'uma'u crater was embedded in a very active hydrothermal system. In 2015, we carried out an electrical conductivity survey and the data were inverted in 3D. The lack of conductivity contrast precludes distinguishing the lava column from the surrounding hydrothermal zones. Laboratory measurements on samples from the lava lake show that the conductivity of magma is significantly lower than that of hydrothermal zones but the high ve-sicularity of the upper part of the lava lake may decrease its macroscopic conductivity. Based on the 3D conductivity model, we distinguish at least two types of hydrothermal circulations: 1) one guided by the collapse faults of Halema'uma'u crater and by the magmatic column of the lava lake, and 2) another guided by previous caldera faults and fractures related to intrusions. We observe that the location of the faults formed during the 2018 collapse of the summit was greatly influenced by the hydrothermally altered zones.
|
Auteur(s) |
Lydie Gailler
1
, Jim Kauahikaua
2
, Jean-François Lénat
1
, André Revil
3
, Marceau Gresse
3
, Abdellahi Soueid Ahmed
3
, Nicolas Cluzel
1
, Geeth Manthilake
1
, Lucia Gurioli
1
, Tim Johnson
4
, Anthony Finizola
5
, Eric Delcher
5
1
LMV -
Laboratoire Magmas et Volcans
( 483019 )
- Campus Universitaire des Cézeaux, 6 Avenue Blaise Pascal, 63178 Aubière Cedex
- France
2
USGS -
United States Geological Survey
( 511919 )
- États-Unis
3
ISTerre -
Institut des Sciences de la Terre
( 222134 )
- BP 53 - 38041 Grenoble cedex 9
- France
4
PNNL -
Pacific Northwest National Laboratory
( 49471 )
- Richland, WA 99352
- États-Unis
5
LGSR -
Laboratoire GéoSciences Réunion
( 109490 )
- Faculté des Sciences et techniques - Université de La Réunion 15 avenue René Cassin CS92003 97744 SAINT DENIS CEDEX 9
- La Réunion
|
Page/Identifiant |
185-192
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Volume |
381
|
Date de publication |
2019-09-01
|
Commentaire |
Co-auteur étranger
|
Date de publication électronique |
2019-06-10
|
Référence interne |
|
Projet(s) ANR |
|
Domaine(s) |
|
DOI | 10.1016/j.jvolgeores.2019.06.001 |
Origine :
Accord explicite pour ce dépôt
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