STUDY ON RESIDUAL HORIZONTAL DISPLACEMENT TO A BREAKWATER BY THE COMPOUND OF EARTHQUAKE AND OVERFLOW TSUNAMI

Abstract

 The recent 2011 off the Pacific coast of Tohoku Earthquake earthquake and tsunami generated huge tsunamis, and many protective facilities were destroyed. Most of the damage was caused by tsunami overflow. After a main shock occurred, many aftershocks occurred. As for the possibility that a structure suffered from by the superposition phenomenon of an earthquake and the tsunami, it is thought. A large-scale hydraulic model experiment was conducted to confirm it about the influence on breakwater in the superposition of an earthquake and the tsunami, and residual horizontal displacement. In superposition of an earthquake and the tsunami of the breakwater, it was affected by the tsunami and confirmed that different residual displacement was produced only in the case of an earthquake. As a result, at an earthquake and the compound action of tsunami overflow, it clarified that there was a tendency to reduction effect of the acceleration and increase of the horizontal displacement.