Upper mantle anisotropy in the New Zealand region

  • Klosko E
  • Wu F
  • Anderson H
 et al. 
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Shear-wave splitting parameters of fast polarization direction (Phi)
and delay time (delta t) are determined using data from the Southern
Alps Passive Seismic Experiment (SAPSE), on the South Island of New
Zealand and in the surrounding region. Our results clearly show that
Phi are subparallel to trends of the Alpine and Marlborough Faults,
and to the Pacific-Australian plate boundary. The delta t values
range from 0.6-2.2 s with an average value of 1.6 s; the largest
values are from the central South Island. The main source of the
observed shear-wave splitting is an anisotropic region between 40-400
km. The width of the zone is approximately 200 km. We attribute the
coincidence of surface structural trends with the measured Phi, and
the large delta t values, to significant shear deformation in a 200
km thick zone along the plate boundary extending from the surface
to deep within the upper mantle.

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  • E. R. Klosko

  • F. T. Wu

  • H. J. Anderson

  • D. Eberhart-Phillips

  • T. V. McEvilly

  • E. Audoine

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