Abstract
The relationship between chemical composition of volcanic rocks and vertical depth from the volcano to the inclined seismic zone has been investigated by some authors only recently.
Under a typical volcanic are, the seismofocal layer shapes an arch and the average depth of seismic foci increases progressively from the center. Such archs are observed in Honshu and Hokkaido and our object is to test in these regions a progressive magmatic evolution as a function of depth by taking into account the complete set of major elements using the correspondence analysis.
There appears to be a definite relationship between seismofocal zone processes in the upper mantle and volcanic activity not only in the direction of the subduction zone transverse to an island are but also in the longitudinal right direction of this are.
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Blot, C., Defossez, M. & Monget, J.M. Relations entre magmas volcaniques et zones séismiques dans les arcs Honshu et Hokkaido. Bull Volcanol 38, 988–997 (1974). https://doi.org/10.1007/BF02597101
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DOI: https://doi.org/10.1007/BF02597101