Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3121602m&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 21, CiteID L21602
Physics
3
Seismology: Body Wave Propagation, Seismology: Continental Crust (1242), Seismology: Lithosphere And Upper Mantle, Tectonophysics: Plate Boundary-General (3040)
Scientific paper
We observe significant spatial variations in shear wave splitting from deep teleseismic S and regional ScS recorded on an array in the fore-arc region of the Hikurangi subduction zone, New Zealand. We also observe variations from different events recorded at the same station. The fast polarization directions range between 23° and 72° and the delay times range between 0.75 s and 1.80 s. These observations contrast with previous SKS studies in New Zealand where little spatial variation is seen, and highlights the importance of using a variety of phases with different periods. Our observations are consistent with a model in which a lateral anisotropic boundary runs ~NE-SW in a zone between Kapiti Island and ~40 km east of the Tararua mountain range. The anisotropic boundary is possibly related to a prominent vertical velocity feature near Kapiti Island.
Marson-Pidgeon Katrina
Savage Martha Kane
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