Spectral and Correlation Analysis of Acoustic Emission Waveforms and Failure Micromechanics in Rocks.

Spectral-Coherency Detection of Periodic and Nonperiodic Acoustic Radiation in Discrete Rock Medium

“…The main feature of the rock massif on site was a monchikite dike on the contact with appatite-nepheline ore. It should be noted that the same signature of AE signals has been revealed at the post-strength stage during the laboratory test of the red granite core [22] (we mentioned in Section 2). This stage is characterized as a frictional sliding or shearing on the fault surfaces.…”

“…In Figure 2, an example of high-frequency AE signal and its spectrum is performed. This example is extracted from AE data acquired during the deformation process of red granite from Blauenthal, Germany [22]. To study the nucleation process of brittle deformation, we conducted laboratory experiments with loading MTS frame on rock cores in GeoForschungsZentrum, Potsdam.…”

“…Thus, an energy transmitted to the system by an impact can be estimated as a sum of energies of each normal mode. In [26,27] it is shown that when radiated Example of AE waveform, (a) and its spectrum and (b) selected from AE data of the red granite experiment (taken from [22]).…”

“…Figure 2.Example of AE waveform, (a) and its spectrum and (b) selected from AE data of the red granite experiment (taken from[22]). …”