It is well known that the frequency distribution of the earthquake scale shows straightrelation on the log-log graph. This relation is considered as the Fractal of the earthquake scaleat present. The Fractal is seen in the general fracture phenomenon including an earthquake.But, the relation between the Fractal and the mechanism of the fracture is not made clear.In this study, the AE in the fracture process of the various rocks was measured and thefrequency distribution ofAE amplitude was examined about the Fractal. As the result, thecharacteristics of the AE amplitude distribution changed by the scale, but the Fractal dimensionof the crack distribution proved that it didnu27t change by the scale.
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