Wide-band magnetotelluric measurements across the Taupo Volcanic Zone, New Zealand-preliminary results

Details Wide-band magnetotelluric measurements across the Taupo Volcanic Zone, New Zealand-preliminary results Wide-band magnetotelluric measurements across the Taupo Volcanic Zone, New Zealand-preliminary results

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3673o&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 24, p. 3673-3676

Physics

Geophysics

13

Exploration Geophysics: Magnetic And Electrical Methods, Geomagnetism And Paleomagnetism: Geomagnetic Induction

Scientific paper

The Taupo Volcanic Zone (TVZ) of New Zealand is characterized by intensive geothermal activity and frequent rhyolitic volcanism. Sixteen wideband (0.01-1,800 s) magnetotelluric soundings were measured along a 110 km-long profile approximately perpendicular to the strike of the TVZ. A model obtained from 2D inversion of the soundings shows two near-surface regions of high conductance which correspond to low density volcaniclastic sediments, up to 3 km thick, which infill a sequence of collapse calderas. At deeper levels (approximately 5-10 km) a resistive layer underlies the entire TVZ. Modelling shows other conductive zones occur beneath the TVZ, with the shallowest lying below the central part at a depth of 10-15 km. Given the high heat flux and volcanic history of the TVZ, the high conductivity at depth may indicate the presence of connected melt. At greater depth (20-30 km) the upper mantle beneath the TVZ appears to be anomalously conductive, consistent with observed high seismic attenuation.

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