India's World Class TSunami Warning Services
Geography and You|July-August 2016

India was a late starter in developing an early warning system for tsunamis. But ever since it became operational, the Indian Tsunami Warning System has developed into a world class platform to serve the entire Indian ocean region.

India's World Class TSunami Warning Services

A tsunami early warning system is devised to detect tsunamis well in advance and issue timely warnings to prevent loss of life and damage. A tsunami early warning system is made up of two components, a network of sensors to detect tsunamis and a communication infrastructure to disseminate timely alarms for evacuation of people from coastal and low lying areas.

The December 26, 2004 earthquake and the subsequent tsunami exposed the vulnerability of the Indian coastline to oceanic hazards. Following the event, India started its own interim tsunami warning center in the first quarter of 2005 to issue tsunami bulletins generated from seismic information. The interim services were succeeded by setting up of a state-of-the-art Indian Tsunami Early Warning System (ITEWS) at the Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, under the Earth System Sciences Organisation (ESSO), Government of India.

Modelling studies indicate that for Tsunami genic earthquakes occurring close to the Andaman and Nicobar Islands, the water arrival time is less than 30 minutes and for the Indian mainland the water arrival time is more than four hours. This means that the criteria to be adopted for issue of warnings need to be different for the islands and for the mainland.

Since immediate warnings need to be issued for Andaman and Nicobar islands, without enough time for confirmation of water levels, this might lead to false alarms. However, in the case of main- land, warnings are issued only upon confirmation of water levels. Hence, there is little chance of any false alarm.

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