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If the area they were placed in was prone to blizzards, earthquakes, terrorist outbreaks or anything else the public to be educated that if it heard the sirens it meant that specific disaster was likely occurring, had occurred or was about to occur.
The sirens are also universally recognized as a warning system therefore the process of installation and public education would not be significantly difficult to complete.
TSUNAMI WARNING SYSTEM
The world was shocked and traumatized when the Indian Ocean Tsunami hit a few years ago and hundreds of thousands of people died as a result of that disaster.
When it struck there was very little or no warning for most of those who were impacted by its arrival.
Most people did not know it was coming until they saw the giant wave coming toward them as they stood on shore (Indian Ocean tsunami warning system (http://news.bbc.co.uk/1/hi/sci/tech/4524642.stm).
While the Pacific Ocean areas have warning systems in place the Indian Ocean areas did not and as a result of that hundreds of thousands of people were killed within a few minutes.
Seismic gauges are relatively simple from a technical standpoint but have the potential and ability to save millions of lives if another tsunami ever hits that region.
One of the concerns with using a seismic indicator to predict a tsunami is that those tools have a high rate of false alarms. This could lead to people in the area to grow accustomed to false alarms and begin ignoring them...
Then when the system tried to warn of a true tsunami on its way they would also ignore it until it was too late.
The answer is to put into place three other tools that do not require advanced technical abilities but can detect a disaster coming.
Recorder on sea bed measures water pressure every 15 mins - an unusual result triggers a reading every 15 secs.
Buoy measures surface conditions and sends this plus data from sea bed to satellite
Satellite receives data and relays it to ground stations (Indian Ocean tsunami warning system (http://news.bbc.co.uk/1/hi/sci/tech/4524642.stm)"
If using this equipment it is determined that a true tsunami is coming or has a likelihood of coming than an outdoor warning system can be activated giving people the time to move to a safe place.
CONCLUSION
Warning systems do not have to be technologically advanced to be effective. An outdoor warning system is not complicated yet can be sounded to save many lives in the event of a disaster. In addition the seismic tools to warn of a tsunami does not take a lot of technology to operate and implement but has the potential to save millions of lives. Both system are perfect answers for the need in underdeveloped nations to warn their residents of disasters.
References
Outdoor Warning System http://www.gocolumbiamo.com/EM/Disaster_Preparedness/sirens.php
Indian Ocean tsunami warning system http://news.bbc.co.uk/1/hi/sci/tech/4524642.stm
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