GEOLOGY

Detailed explanation-1: -An approaching tsunamis is sometimes preceded by a noticeable rise or fall of coastal water. This is a natural warning; people should move inland away from the shoreline. When the sea begins to drain away, do not go to investigate, but quickly go inland away from the shoreline.

Detailed explanation-2: -This wall of water finally arrives at the coast travelling at 30 to 50 km/hr (30 mph) causing massive destruction. Why does the water level drop before the tsunami hits? Because it is like a tide, the tide goes out before it comes in.

Detailed explanation-3: -When a tsunami reaches shore, it may appear as a rapidly rising or falling tide, a series of breaking waves, or even a tidal bore. Reefs, bays, entrances to rivers, undersea features and the slope of the beach all help to modify the tsunami as it approaches the shore.

Detailed explanation-4: -One of the signs of a potential tsunami is the occurrence of a very large earthquake that lasts for more than 20 seconds. If an area has been shaken by a very large earthquake, one should be on alert that shorelines located within the radius of the earthquake’s epicentre, may be hit by a tsunami.

Detailed explanation-5: -A tsunami’s trough, the low point beneath the wave’s crest, often reaches shore first. When it does, it produces a vacuum effect that sucks coastal water seaward and exposes harbor and sea floors.