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EARLY WARNING SYSTEM
The word Tsunami comes from Japan. The general way to pronounce Tsunami is Su-Nah-Mee. The meaning of Tsu is harbor, and the word nami means wave in short harbor wave. It is use globally to reffer to a series of wave travelling across the ocean with very long wavelengths and has enough strength to cause mass destruction of life and property.
Seismic disturbances, volcanic activities, submarine faulting are the main reasons for occurrence of Tsunami. A seismic disturbance can move the sea water causing a rise or fall in the level of the ocean. The seismic disturbance occurs due to the displacement of tectonic plate. The rise or fall in sea water level is the early formation of a tsunami wave. This wall of water sometimes turns out to be more than 100 feet height.
| After the earthquakes occurs, the energy travel outward in all directions from the center of earthquakes. The amount of time beetween consecutive waves, called as the wave period, is only a few minutes to an hour. As the tsunami crosses the ocean, its length from crest to crest maybe around hundred miles, and its vertical height from a few feet to more than 30 meter. In the deepest part of oceans, the waves will touch the speeds of 600 -750 miles per hour, travelling across the ocean in less than a day. Early Warning System (EWS) of Tsunami was designed and develope through VPN Polri and SMS media in year 2006 to obtained early warning information from BMG (Badan Metreologi dan Geofisika),, which will be then distributed to areas that have been predicted to be affected by this natural disasster to avoid causalities |
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