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Hundreds of meters of uplift of both the frontal arc and backarc characterize the late Quaternary vertical tectonic history of the central New Hebrides Island Arc. This vertical deformation is directly related to large, shallow earthquakes on the interplate thrust zone postulated on the basis of coral emergence data. This chapter presents evidence from the best documented and illustrated examples of uplifted coral reefs from the central New Hebrides Island Arc for the pattern and rates of vertical deformation caused by subduction of the d'Entrecasteaux Zone and the West Torres Massif over the past few 100 k.y. The pattern of vertical movement based on upper Quaternary coral reef terraces documents that the islands of Espiritu Santo, Malakula, Pentecost, and Maewo have risen hundreds of meters during the late Quaternary. This history suggests that the present pattern and rates of vertical deformation should be extrapolated back to at least 1 Ma, which would indicate that the total amount of structural and morphological modification of the arc during the present phase of deformation is more significant than previously assumed. The morphology of the central New Hebrides Island Arc may have resembled a more typical arc-trench area only 1-2 Ma. If the late Quaternary patterns and rates of vertical deformation have affected the central New Hebrides Island Arc since 1-2 Ma, then virtually all of the anomalous morphology that characterizes the central New Hebrides Island Arc can be attributed to the subduction of the d'Entrecasteaux Zone and the West Torres Massif.

Quaternary Vertical Tectonics of the Central New Hebrides Island Arc