Tsunami Warning System And Other General Info
What Is A Tsunami ?
A tsunami is a series of waves traveling at speeds of over 800 km/h in the deep ocean where they go unnoticed. Once the waves reach the shallow waters of the coast, the energy of the huge water body manifest themselves as they crash with devastating force across the shore, flooding low-lying areas, causing death and severe destruction. Tsunamis are generated primarily by earthquakes occurring below or near the ocean floor. Underwater volcanic eruptions, landslides or a meteorite can also generate tsunamis.
What Type Of Earthquake Generates A Tsunami?
Tsunamis are typically generated by earthquakes that occur along subduction zones. A subduction zone is an area on the earth where two tectonic plates meet and move towards one another, with one sliding underneath the other and moving down into the earth at rates typically measured in centimetres per year.
Is Mauritius At Risk?
Mauritius has been spared from the December 26, 2004 tsunami disaster and so far we have no record of any significant tsunami affecting Mauritius. Nevertheless, there is a possibility that Tsunamis generated from either the Sumatra or the Makran source may reach the coasts of Mauritius or Rodrigues. Thus, we have to be prepared and be ready in the event of a potentially destructive tsunami.
Tsunami Warning System In Mauritius
The Tsunami Warning System in Mauritius has taken into consideration the degree of risk as well as the time factor. In virtue of its geographical location, Mauritius and Rodrigues have a lead-time of 5-7 hours before tsunami waves are likely to reach their coasts from either the Sumatra or the Makran source. The warning system will consist of the following stages:
1. Tsunami Watch
This bulletin implies that a strong earthquake, generally of the magnitude greater than or equal to 7.0 on the Richter Scale, has occurred in a region adjacent to the Indian Ocean and the likelihood of a tsunami being generated is evoked. The bulletin is issued as a means of providing an advance alert to areas that could be impacted by destructive tsunami waves.
At this stage, the public, sea-goers and fishermen in particular will be advised not to venture out at sea or on the beach, boats to be secured ashore and vessels to proceed off lagoon.
2. Tsunami Warning
This bulletin confirms that a destructive tsunami will affect Mauritius / Rodrigues within the next 5-7 hours. In case the incident point is closer to Mauritius / Rodrigues, the lead-time will be correspondingly lesser. Plan for the evacuation of vulnerable coastal areas will be implemented.
This bulletin will be issued after information from the Police, Fisheries post, Environment Officials, observations from tide gauges at Port Louis and Port Mathurin and general sea state observation confirm that significant tsunami waves are no longer being noted.
When To Evacuate?
When a Tsunami Warning Bulletin is issued by the Mauritius Meteorological Services, announcements to evacuate will be made through TV & radio stations and Police hailers. The public is advised to follow the directives of the Police during evacuation.
Those living or working in coastal areas should immediately move to higher grounds
Things to Remember