ABSTRACT
This chapter will review applications of the moment tensor method on acoustic emission events in rock of greatly differing scales of some hundred meters down to several centimeters. These are acoustic emission measurements in underground laboratory and parts of a mine (large-scale applications), during underground hydraulic fracturing tests in rock (intermediate-scale applications), as well as in laboratory studies on rock specimens (small-scale applications). The moment tensor method pointed out that deviatoric stress induced acoustic emission shows high proportion of volumetric source components, while hydraulically induced acoustic emission shows shear mechanisms without significant volumetric source components.
