Earthquake or volcano burst to the surface of the earth crust are further. Some of the higher part of the skin to collapse down, especially when an underwater volcano exploding will cause big waves in the ocean. The floods occurred on the Islands or the beach cities.
Earthquake or volcanic eruption Make the crust of the Earth's surface has been affected. Some of the surface will be higher. Some will collapse Especially when underwater volcanic eruption. To cause big waves in the ocean. Caused flooding on islands or coastal towns.
An earthquake or volcanic eruption. The shell of the earth's surface damage, some of the skin will be higher. Some will fall down, especially when the volcano underwater blast. Will cause a big waves in the ocean.