Study on the scaling law for micro-fracture during rock fracture experiments

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Micro-fracture occurs accompanied by acoustic emission (AE) during a rock fracture experiment. Owing to a high activity of AE, clear increasing phase has been observed just before the main fracture, which attracts the attention in the view point of precursory phenomena. In this study, using waveforms from broadband continuous recording of AE during rock fracture experiments and high frequency recording of ultra-micro seismic events in mine, it is suggested that AE and mining induced ultra-micro seismic events follow the same scaling law for natural earthquakes.