Shear wave velocity variation across the Taupo Volcanic Zone, New Zealand, from receiver function inversion

The Taupo Volcanic Zone (TVZ), New Zealand is a region characterized by very high magma eruption rates and extremely high heat flow, which is manifest in high-temperature geothermal waters. The shear wave velocity structure across the region is inferred using non-linear inversion of receiver functio...

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Bibliographic Details
Published inGeophysical journal international Vol. 159; no. 1; pp. 291 - 310
Main Authors Bannister, S., Bryan, C. J., Bibby, H. M.
Format Journal Article
LanguageEnglish
Published Oxford, UK Blackwell Publishing Ltd 01.10.2004
Blackwell Science Ltd
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Summary:The Taupo Volcanic Zone (TVZ), New Zealand is a region characterized by very high magma eruption rates and extremely high heat flow, which is manifest in high-temperature geothermal waters. The shear wave velocity structure across the region is inferred using non-linear inversion of receiver functions, which were derived from teleseismic earthquake data. Results from the non-linear inversion, and from forward synthetic modelling, indicate low S velocities at ∼6–16 km depth near the Rotorua and Reporoa calderas. We infer these low-velocity layers to represent the presence of high-level bodies of partial melt associated with the volcanism. Receiver functions at other stations are complicated by reverberations associated with near-surface sedimentary layers. The receiver function data also indicate that the Moho lies between 25 and 30 km, deeper than the 15 ± 2 km depth previously inferred for the crust–mantle boundary beneath the TVZ.
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ISSN:0956-540X
1365-246X
DOI:10.1111/j.1365-246X.2004.02384.x