A tsunami is a series of massive sea waves caused by underwater earthquakes, landslides, or volcanic eruptions. Tsunamis can travel across entire oceans at speeds up to 800 km/h but remain unnoticed at sea due to their small height. However, when they reach shallow coastal waters, the top of the wave moves faster than the bottom, causing the sea to rise dramatically to heights over 30 meters. The most devastating tsunami on record was on December 26, 2004 when a massive earthquake off the coast of Sumatra, Indonesia triggered a tsunami that caused widespread destruction across the Indian Ocean region.

1. TSUNAMI
EFFECT

2. What does the word Tsunami mean?
• The term tsunami comes from the Japanese meaning harbour
and wave. Tsunamis are common throughout Japanese history;
approximately 195 events in Japan have been recorded over the
centuries.
• It was called this because Tsunamis can suck all the water
out of a harbour before the waves come back into
shore. These waves may grow more than 100 feet tall and
flatten whole villages. Hence its meaning.

3. What is a Tsunami?
• A tsunami is a series of great sea waves caused by an
underwater earthquake, landslide, or volcanic eruption. It is very
rare but sometimes a tsunami can be generated by a giant
meteor impact with the ocean
• Try and imagine when you have tossed a pebble into a pond,
then watched ripples spread out over the surface? Well a
Tsunami works in much the same way.
• These underwater earthquakes, landslides, or volcanic
eruptions can generate a tsunami by creating a sufficient force
and violent movement of the earth. This movement then
causes a substantial and sudden displacement of a massive
amount of water.

5. How it forms?
• When the ocean is deep tsunamis can travel unnoticed on the
surface at speeds up to 800 kms per hour, crossing the entire
ocean in a day or less! A tsunami may be less than 30cm in
height on the surface of the open ocean, which is why they are
not noticed by sailors.
• The powerful shock wave of energy travels rapidly through the
ocean as fast as a commercial jet. Once a tsunami reaches
shallow water near the coast it is slowed down. The top of the
wave moves faster than the bottom, causing the sea to rise
dramatically and wave to get allot bigger!
• Tsunamis have been known to get as high as 30 meters,
however most tsunamis cause the sea to rise no more than 9
meters.

6. What is the
most
devastating
Tsunami on
record?
December 26,2004

12. Made
by
lalith
sai
• Nalanda vidya nikethan , vijayawada