Relocation of AE Events from a Compression Test of a Rock Salt Specimen by Coherence Collapsing Method

The authors combined the concept of the Collapsing method and multiplet analysis, and derived an algorithm that is a variation of the collapsing method (Coherence Collapsing method). In the Coherence Collapsing method, the absolute locations of the multiplets are selectively located to the simplest structure, and the whole AE/MS cloud is optimized in the same manner as in the Collapsing method. Because the multiplets are related to the multiple slip of a fracture/fault, their locations are of importance to interpret the physical phenomenon. In this paper, we describe an application of the Coherence Collapsing method to the AE events from a compression test of a salt rock specimen and compare the locations with the distribution of the fractures in the specimen.