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Article Dans Une Revue Bulletin of Volcanology Année : 2017

Monitoring the cooling of the 1959 Kīlauea Iki lava lake using surface magnetic measurements

Lydie-Sarah Gailler
Jim Kauahikaua
  • Fonction : Auteur

Résumé

Lava lakes can be considered as proxies for small magma chambers, offering a unique opportunity to investigate magma evolution and solidification. Repeated magnetic ground surveys over more than 50 years each show a large vertical magnetic intensity anomaly associated with K ī lauea Iki Crater, partly filled with a lava lake during the 1959 erup- tion of K ī lauea Volcano (Island of Hawai ’ i). The magnetic field values recorded across the K ī lauea Iki crater floor and the cooling lava lake below result from three simple effects: the static remnant magnetization of the rocks forming the steep crater walls, the solidifying lava lake crust, and the hot, but shrinking, paramagnetic non-magnetic lens (>540 °C). We calculate 2D magnetic models to reconstruct the temporal evolution of the geometry of this non-magnetic body, its depth below the surface, and its thickness. Our results are in good agreement with the theoretical increase in thick- ness of the solidifying crust with time. Using the 2D magnetic models and the theoretical curve for crustal growth over a lava lake, we estimate that the former lava lake will be totally cooled below the Curie temperature in about 20 years. This study shows the potential of magnetic methods for detecting and monitoring magmatic intrusions at various scales.
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Dates et versions

hal-01710785 , version 1 (16-02-2018)

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Citer

Lydie-Sarah Gailler, Jim Kauahikaua. Monitoring the cooling of the 1959 Kīlauea Iki lava lake using surface magnetic measurements. Bulletin of Volcanology, 2017, 79 (6), ⟨10.1007/s00445-017-1119-7⟩. ⟨hal-01710785⟩
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