Convection currents in the mantle move the plates towards each other An earthquake rocks the ocean floor as plates on a destructive boundary collide. Water is displaced and pushed up. Sea water is sucked back from the shore. Wave height increases as it gets closer to the shore. A tsunami hits land at great speed and damages an area badly. Convection currents in the mantle move the plates towards each other An earthquake rocks the ocean floor as plates on a destructive boundary collide. Water is displaced and pushed up. Sea water is sucked back from the shore. Wave height increases as it gets closer to the shore. A tsunami hits land at great speed and damages an area badly. Convection currents in the mantle move the plates towards each other An earthquake rocks the ocean floor as plates on a destructive boundary collide. Water is displaced and pushed up. Sea water is sucked back from the shore. Wave height increases as it gets closer to the shore. A tsunami hits land at great speed and damages an area badly.