Felt Radius
Felt Radius :
The "felt radius" is based on the average distance from the epicentre to the Modified Mercalli Intensity (MMI) III isoseismal contour. Intensity values are a measure of the level of ground shaking at a specific location. The isoseismal contours outline areas which experience a given level of shaking or higher and are based on reports submitted to Geoscience Australia or other agencies. The amount of shaking people feel from an earthquake can be affected by factors such as the depth of the earthquake and the local geology. These factors are not taken into consideration in the calculation of the felt radii, so these radii are very approximate and should only be taken as a very rough guide to the area in which people would feel an earthquake
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