Mapping the Moho beneath the Southern Alps continent-continent collision, New Zealand, using wide-angle reflections

Details Mapping the Moho beneath the Southern Alps continent-continent collision, New Zealand, using wide-angle reflections Mapping the Moho beneath the Southern Alps continent-continent collision, New Zealand, using wide-angle reflections

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3117602h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 17, CiteID L17602

Physics

4

Seismology: Continental Crust (1242), Tectonophysics: Continental Contractional Orogenic Belts, Tectonophysics: Dynamics, Gravity And Tectonics

Scientific paper

A wide-angle stack using all onshore-offshore, and onshore seismic data from the SIGHT'96 experiment provides a direct three-dimensional (3-D) image of the Moho below the continental collision zone through the South Island of New Zealand. A bright reflector sequence (up to 4 s thick), the base of which coincides with the PmP modeled Moho, extends throughout most of the lower crust and bends downward asymmetrically beneath the Southern Alps. The crustal root reaches a maximum depth at ~15 s (45 km), beneath the regional (-80 mGal) Bouguer gravity low and is flanked east and west by shallower Moho where the average crustal thickness is ~20 km. The 3-D structure of the crustal root in the central South island is moderately well resolved by the SIGHT'96 experiment.

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