Monday, 8 April 2013

WARNING AND PREDICTIONS OF TSUNAMI



Japanese tsunami warning sign


tsunami warning system is used to detect tsunamis in advance and issue warnings to prevent loss of life and damage. Although a tsunami cannot be prevented, the impact of a tsunami can be mitigated through community preparedness, timely warnings, and effective response.



deep water bouy 


A tsunami cannot be precisely predicted, even if the magnitude and location of an earthquake is known. , researchers analyse that each earthquake and based on many factors may or may not issue a tsunami warning. However, there are some warning signs of an impending tsunami, and automated systems can provide warnings immediately after an earthquake in time to save lives. One of the most successful systems uses bottom pressure sensors, attached to buoys, which constantly monitor the pressure of the overlying water column.




When operating, seismic alerts are used to instigate the watches and warnings, then, data from observed sea level height are used to verify the existence of a tsunami.



Tsunami warning siren
Regions with a high tsunami risk typically use tsunami warning system to warn the population before the wave reaches land. On the west coast of the United States, which is prone to Pacific Ocean tsunami, warning signs indicate evacuation routes. In Japan, the community is well-educated about earthquakes and tsunamis, and along the Japanese shorelines the tsunami warning signs are reminders of the natural hazards together with a network of warning sirens, typically at the top of the cliff of surroundings hills.






In addition, computer models can predict tsunami arrival, usually within minutes of the arrival time. Bottom pressure sensors relay information in real time. Based on these pressure readings and other seismic information and the seafloor's shape and coastal topography, the models estimate the amplitude and surge height of the approaching tsunami.


Tsunami Evacuation Route
 signage along U.S route








No comments:

Post a Comment

Post a Comment