Abstract
The authors use the boundary element method in the 2D elastic problem to investigate the regularities of the principal stress distribution in the subduction of the oceanic plate under the continental plate under different boundary conditions. The investigation covers the cases when the fault zone has irregularities and the fault zone boundary is smooth. The point displacements at the boundaries of the continental and oceanic plates are analyzed. It is shown that the anticlimax induced by an instantaneous failure along the fault zone irregularities can generate an earthquake with M s = 7.5 and higher magnitude, with 2–7-meter shears of the oceanic and continental lithospheric plates.
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