Depressurization of a hydrothermal system following the August and November 2012 Te Maari eruptions of Tongariro, New Zealand

I. J. Hamling, C. A. Williams, S. Hreinsdóttir

doi:10.1002/2015gl067264

Depressurization of a hydrothermal system following the August and November 2012 Te Maari eruptions of Tongariro, New Zealand

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I. J. Hamling

GNS Science Lower Hutt New Zealand
C. A. Williams

GNS Science Lower Hutt New Zealand
S. Hreinsdóttir

GNS Science Lower Hutt New Zealand

書誌事項

公開日: 2016-01-14

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1002/2015gl067264

公開者: American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>In 2012, two phreatic eruptions occurred at New Zealand's Tongariro volcano for the first time in over a century. Interferometric Synthetic Aperture Radar data collected by the Italian Space Agency's COSMO‐SkyMed satellite constellation, indicates up to 20 mm/yr of post eruptive subsidence focused across a 4 km<jats:sup>2</jats:sup> region in the vicinity of the eruption site. Modeling of the deformation data indicates a shallow source at ∼500 m depth (1100 m asl) consistent with the depth of the hydrothermal system. We estimate an annual volume loss of 35,000 m<jats:sup>3</jats:sup>, leading to a pressure loss of ∼0.09 MPa/yr. We suggest that fracturing associated with the eruptions has enabled the continued depressurization of the shallow hydrothermal system and that subsidence will continue until the fractures become resealed.</jats:p>