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In this paper we analyse the upward earthquake hypocentral migration in the ten known subduction zones and discuss a possible mechanism of such migration. The total time of the migration appears to range from 2.5 to 10 years. It leads to the estimation of the average velocity V z ∼ 60 − 300 km yr −1 . It probably corresponds to the movement of the forcing agent like stress or deformation wave from depths of the upper mantle (600-700 km) to the level of the lithosphere with subsequent initiationdoi:10.5194/nhess-11-135-2011 fatcat:hgswnzg3xzhihjpeb5ysxxre54