Morphology and volcanism of the Wadati-Benioff zone in the Tonga-Kermadec system of recent subduction
- 1 December 1979
- journal article
- research article
- Published by Taylor & Francis in New Zealand Journal of Geology and Geophysics
- Vol. 22 (6) , 659-671
- https://doi.org/10.1080/00288306.1979.10424174
Abstract
The morphology of the Wadati-Benioff zone in the Tonga-Kermadec island arc verified the existence of an intermediate aseismic gap in the recent subduction zone and its relation to active andesitic volcanism. The gap, interpreted as a partially melted zone, appears to be the source of primary magma for andesitic volcanoes. A clear correlation between the depth of penetration of the Wadati-Benioff zone and the major physiographic units of the ocean floor implies a nonuniform rate of subduction along the Tonga-Kermadec trench due to the hampering effect of the main structural features of the subducting Pacific plate.Keywords
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