BY Rohit Chaurasia71/08III B. Tech Civil Engg.

Tsunami is a series of waves with extremely long wave length and long period generated when a body of water rapidly displaced.

The term 'tsunami' comes from the Japanese, meaning "harbor" (tsu ) and "wave" (nami )

• Earthquake• mass movements above or below water• some volcanic eruptions• Underwater explosions• Landslides

Earthquake

Water column up and down

Potential energy

Kinetic energy

Tsunami

Earthquakes, volcanic eruptions and other underwater explosions below water all have the potential to generate a tsunami.

• Speed:

V =√g h

• Intensity:

I = 0.5 log 2H

H = average maximum run-up height

Tsunami Velocities

Max Run up : Amplitude : Wave Length : Tsunamis are shallow-water

waves. Its height in deep water is very less but when it penetrates in shallow water, its speed & wave length decreases & height increases.

• Earthquakes are often a cause of tsunami.

• If the part of tsunami to reach land is trough the water along the shoreline may recede dramatically, exposing areas that are normally always submerged,It’s a big sign of tsunami.

• A tsunami cannot be prevented or precisely predicted.

• Bottom pressure sensor:

These are anchored and attached to buoys. Sensors on the equipment constantly monitor the pressure of the overlying water column.

Bottom pressure sensor:

A Tsunami Warning System (TWS) is a system to detect tsunamis and issue warnings to prevent loss of life and property. It consists of two equally important components: a network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to peoples.

• It is not possible to prevent a tsunami. But we can mitigate losses from it by-• Making sea wall

sea wall of japan

• Making floodgates and channels to redirect the water from incoming tsunami.

• Plantation of mangroves and coastal forests along the coast line.

.• Development of tsunami detection, forecasting and warning centers.

Japan was hit by an giant earthquake on March 11,2011, that triggered a deadly 23-foot tsunami in the country's north.

Its magnitude was 8.9. More than 20,600 were

confirmed dead and more than 13,000 peoples still missing.

Three nuclear reactors destroyed.

Tsunami is a natural, unstoppable but predictable phenomenon. We can’t avoid it but we can mitigate its losses by taking appropriate preventive measures.

Thank You