Geometry of the Hikurangi subduction thrust and upper plate, North Island, New Zealand

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  • Daniel H. N. Barker
    GNS Science P.O. Box 30‐368, 1 Fairway Drive, Avalon, Lower Hutt New Zealand
  • Rupert Sutherland
    GNS Science P.O. Box 30‐368, 1 Fairway Drive, Avalon, Lower Hutt New Zealand
  • Stuart Henrys
    GNS Science P.O. Box 30‐368, 1 Fairway Drive, Avalon, Lower Hutt New Zealand
  • Stephen Bannister
    GNS Science P.O. Box 30‐368, 1 Fairway Drive, Avalon, Lower Hutt New Zealand

書誌事項

公開日
2009-02
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2008gc002153
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We use 2800 line km of seismic reflection data to map the offshore character and geometry of the Hikurangi subduction thrust and outer forearc wedge to depths of ∼15 km. For 200 km along‐strike south of Hawke Bay, the subduction thrust is relatively smooth, dips less than 8°, and the wedge is characterized by accretion of young sediment and topographic slopes of less than 3°. In Hawke Bay and north for 200 km, a kink in the subduction thrust is apparent, with a downdip increase in dip to angles greater than 8° at depths of 10–15 km; there is a corresponding steepening of the topographic slope to greater than 3° outboard of the kink and the wedge is characterized by lithified sedimentary rock and slope failure. The kink in the subduction thrust is a locus of inherent weakness in the subducting slab; we suggest its occurrence relates to a northward increase in subduction rate that controls initial slab dehydration and fluid release rates and hence intraslab deformation patterns. The subduction thrust geometry, in combination with a northward increase in subducting plate roughness and decrease in the amount of sediment accreted, causes the observed spatial change in character of the subduction thrust and forearc wedge.</jats:p>

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