Question

what scale is used to determined the severity of your natural disaster

Answer 1

The scales used are different for different disaster :
For earthquake, Richter Scale is used.
For hurricanes, Saffir-Simpson Scale is used.

Answer 2

Answer:

The most common scale used to measure the intensity of earthquakes is the Richter scale.

Earlier there was a tsunami intensity scale used to measure the intensity of tsunamis. However, now it is done by measuring the height of the shore.

The Saffir-Simpson Hurricane Wind Scale is used for measuring the severity of cyclones and hurricanes.