What’s TSUNAMI?Tsunami is a series of waves of longwavelength. . .usually generated by a violent,impulsive undersea disturbance. . or activity near the coast. . or in the ocean.
What’s TSUNAMI?•When a sudden displacement of a largevolume of water occurs,•or if the sea floor is suddenly raised ordropped by an earthquake•or non seismic disturbances such asvolcanic eruptions•or underwater landslides occurs - big tsunami waves can be formed by forces of gravity.
What’s TSUNAMI? It should be noted that not allearthquakes generate tsunamis. Usually,it takes an earthquake with a Richtermagnitude exceeding 7.5 to produce adestructive tsunami.
Difference between Tides & TsunamisNormal Tides are caused by theextraterrestrial, gravitational influencesof the moon, sun, and the planets.
Which are likely zones for Tsunami?By far, the most destructive tsunamis aregenerated from large, shallow earthquakes - -withan epicenter or fault line near or on the oceanfloor.These usually occur in regions of the earthcharacterized by tectonic subduction alongtectonic plate boundaries.
History of TsunamisOne of the largest and most destructive tsunamis ever recorded prior to the latest was generated in August 26, 1883 after the explosion and collapse of the volcano of Krakatoa (Krakatau), in Indonesia. This explosion generated waves that reached 135 feet, destroyed coastal towns and villages along the Sunda Strait in both the islands of Java and Sumatra, killing 36, 417 people.
History of TsunamisIt is also believed that thedestruction of the Minoan civilizationin Greece was caused in 1490 B.C. bythe explosion/collapse of the volcanoof Santorin in the Aegean Sea.
Tsunamis-Where & How often? Most tsunamis occur in the PacificOcean and its marginal seas. Thereason is that the Pacific covers morethan one-third of the earths surfaceand is surrounded by a series ofmountain chains, deep-ocean trenches- where most earthquakes occur.
Tsunamis-Where & How often?On the average about half-a-dozentimes per century, a tsunami from oneof the Pacific regions sweeps acrossthe entire Ocean.
Tsunamis-Where & How often?In the last decade alone, destructivetsunamis have occurred 13 times…Nicaragua (1992),Indonesia (1992, 1994, 1996, 2004),Japan (1993),Philippines (1994),Mexico (1995),Peru (1996, 2001),Papua-New Guinea (1998),Turkey (1999), andVanuatu (1999).
The salient aspects of this slide areextracted and shown in the following slides
Highest overall inundation: Bangladesh closely followed by IndiaHighest damage to Agriculture Land: Bangladesh closely followed by India
SRI Guest House – a Venue for Shelter andCrisis Management Operations
• Some of our colleagues lost their life.• Some lost their near and dear.• Most of the unfortunate victims were women and children.• Some lost their entire life’s earnings.• Let all the traumatised overcome the grief, sorrow and shock at the earliest.• Anupuram township provided much needed shelter to many residents of Kalpakkam Township.• SRI Guest House provided shelter to thousands of Kalpakkam residents including many from nearby villages.• Imagine the plight of many if we did not have the Anupuram Township and SRI Guest House
Acknowledgements• Dr. T. Subba Rao• Mr. V. Sridhar• Dr. N. Mohan Kumar• Dr. B.P.C. Rao• Dr. V.P. Venugopalan• Mr. P. Padmaraju