Imaging the Hikurangi subduction zone, New Zealand, using teleseismic receiver functions: crustal fluids above the forearc mantle wedge

Details Imaging the Hikurangi subduction zone, New Zealand, using teleseismic receiver functions: crustal fluids above the forearc mantle wedge Imaging the Hikurangi subduction zone, New Zealand, using teleseismic receiver functions: crustal fluids above the forearc mantle wedge

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.169..602b&link_type=abstract

Geophysical Journal International, Volume 169, Issue 4, pp. 602-616.

Astronomy and Astrophysics

Astronomy

6

Crustal Structure, Low-Velocity Layer, Plate Boundary, Seismic Array, Seismic Velocities, Waveform Analysis

Scientific paper

We image the Hikurangi subduction zone using receiver functions derived from teleseismic earthquakes. Migrated receiver functions show a northwest dipping low shear wave feature down to 60 km depth, which we associate with the crust of the subducted Pacific Plate. Receiver functions (RF) at several stations also show a pair of negative and positive polarity phases with associated conversion depths of ~20-26 km, where the subducted Pacific Plate is at a depth of ~40-50 km beneath the overlying Australian Plate. RF inversion solutions model these phases with a thin low S-wave velocity zone less than 4 km thick, and an S-wave velocity contrast of more than ~0.5 km s-1 with the overlying crust. We interpret this phase pair as representing fluids near the base of the lower crust of the Australian Plate, directly overlying the forearc mantle wedge.

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