Unfolding the subducting plate in the central New Hebrides Island arc - Geometrical argument for detachment of part of the downgoing slab

Details Unfolding the subducting plate in the central New Hebrides Island arc - Geometrical argument for detachment of part of the downgoing slab Unfolding the subducting plate in the central New Hebrides Island arc - Geometrical argument for detachment of part of the downgoing slab

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..655c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 8, p. 655-658.

Mathematics

Logic

8

Geological Faults, Plates (Tectonics), Seismology, Subduction (Geology), Earthquakes, Least Squares Method, S Waves, Three Dimensional Models

Scientific paper

In the central part of the New Hebrides island arc a sizable gap exists in the seismic activity. Seismic observations in the zone of the gap have been previously interpreted as either related to a detachment of part of the downgoing slab or associated with a continuous slab. We give a geometrical argument which, added to the seismic observations from previous studies, constitutes a further argument in favor of the detachment hypothesis. After unfolding the downgoing plate and restoring it to its initial state, using a 3D balance technique, we show that the gap can be filled with three pieces. Two of these pieces are seismic zones located beneath the seismic gap, and the third one is a deep (550 - 650 km) seismic zone located about 200 km northeast of the arc. These three pieces could be detached parts of the subducting plate.

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