The scale for a Tsunami is a Richter scale. The Richter Scale is a scale that measures earthquakes, and Tsunamis are normally made by earthquakes. But be careful, because Tsunamis are normally formed by 6.5's or greater on the Richter Scale.
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Actually, the Richter Scale is invalid, and we do not use it any more. The scale we use today is the MMS, or Moment Magnitude Scale.
In the MMS, every point up the scale (Which goes from 1-10), multiplies it's magnitude by 30.
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Tsunamis are not measured on the Richter scale, but the earthquakes that usually cause them can be.
The 2004 tsunami was not measured on the Richter scale because tsunamis are caused by underwater disturbances, usually earthquakes, landslides, or volcanic eruptions. The earthquake that triggered the 2004 tsunami had a magnitude of 9.1-9.3 on the moment magnitude scale, not the Richter scale.
A big quake on the ricter scale should be more than 8.2 to trigger a tsunami.
The Tsunami (and most Tsunamis) are caused by earthquakes that take place deep under the seabed. The greater the severity of the earthquake, the larger, and more devastating, a Tsunami will be.
The intensity of tidal waves is typically measured using a scale called the "Tsunami Intensity Scale" or the "Tsunami Magnitude Scale." This scale measures the amplitude of the waves, the speed at which the waves are traveling, and the energy they carry. The higher the magnitude on the scale, the more intense the tidal wave is considered to be.
It doesn't. The Fujita scale classifies tornadoes based on the severity of the damage they cause.