The Kermadec intraoceanic arc marks the southernmost section of the Pacific Ring of Fire in the western Pacific region, a chain of mostly underwater volcanoes that stretches from north of Japan southward to New Zealand. The Kermadec arc, striking for 1,200 km from Monowai volcano to the North Island of New Zealand, represents the southern portion of the contiguous ~2,500-km Kermadec-Tonga arc (Fig. 1; de Ronde et al., 2003). The Kermadec arc is populated by almost 30 volcanic centers comprising single, large caldera or cone volcanoes, or less commonly, groups of relatively smaller cones (de Ronde...

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