Based on laboratory experiments and geological and geophysical data, a model for the subduction zone was derived. The subduction zone modeled includes a relatively low-viscous layer (h), crust (k) heated to melting temperature, and a melting zone, with diapir formed at its boundary. A theoretical solution is obtained to the problem on a zone of the (h + k) layer heated to melting temperature, and conditions are determined under which volcanism exists in the subduction zone. Given that the melt amount corresponds to the amount of the subducted crust matter (h + k), we have obtained a criterion equation to characterize conditions of the origin of volcanism. The rate of diapir uplift and parameters of the diapir-feeding conduit are estimated.
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