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Book Chapter

The New Hebrides Trench, Lines 1 and 12

By
Michael A. Fisher
Michael A. Fisher
U.S. Geological Survey Menlo Park, California
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H. Gary Greene
H. Gary Greene
U.S. Geological Survey Menlo Park, California
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Published:
January 01, 1986

Abstract

The New Hebrides island arc strikes northward through the southwestern Pacific Ocean and parallels the trench where the Australia-India plate on the west is subducted beneath the North Fiji basin on the east. Convergence between the oceanic plate and the arc occurs in an easterly direction (N75E) as determined from earthquake focal mechanisms (Pascal et al., 1978; Isacks et al., 1981). However, the rate of convergence is poorly constrained because of plate motion beneath the North Fiji basin. Chase (1971) estimates an 8 cm/yr convergence rate at the New Hebrides trench, whereas Taylor et al. (1985) propose a convergence rate between 11 and 20 cm/yr.

The d'Entrecasteaux Zone (DEZ) is a large submarine mountain system that extends north and east from New Caledonia to where it collides with the New Hebrides arc. Near the arc the DEZ consists of two subparallel ridges that trend east-west and show considerable topographic relief. Collision of the DEZ with the arc has apparently caused abrupt transitions from a single axial line of volcanic islands south and north of the intersection to triple chains of islands at the intersection. The Aoba basin formed within the arc's summit and lies beneath 2000 to 3000 m of water. Although summit basins are present outside of the collision zone, the Aoba basin has greater bathymetric expressions than any other summit basin. The main objective of this discussion is to describe two seismic lines—-one obtained within and one obtained outside of this collision zone—-to illustrate the contrast in structure

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Contents

AAPG Studies in Geology

Seismic Images of Modern Convergent Margin Tectonic Structure

Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Susan Vath
Susan Vath
U.S. Geological Survey Menlo Park, California
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Christine Sperber
Christine Sperber
U.S. Geological Survey Menlo Park, California
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Bridgett Fulop
Bridgett Fulop
U.S. Geological Survey Menlo Park, California
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Lee Bailey
Lee Bailey
U.S. Geological Survey Menlo Park, California
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Monique Martin
Monique Martin
U.S. Geological Survey Menlo Park, California
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American Association of Petroleum Geologists
Volume
26
ISBN electronic:
9781629811499
Publication date:
January 01, 1986

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