Fig. 1. Map showing the plates of the Pacific region. Full arrows represent the rate of plate movement (cms.yr¹) with respect to the body of the earth and half arrows the relative movement (cms.yr¹) between adjacent plates at major transform faults. Spreading axes are shown as double lines, transform faults as single lines and subduction zones as barbed lines with the barbs pointing away from the downgoing plate. New Zealand's position at the boundary between the Indo-Australian and Pacific plates is well illustrated in this diagram. Map reproduced from Moore (1982, Fig. 1).