Koji Masuda

TL;DR: In this paper, a detailed time-space distribution of acoustic emission (AE) events during the catastrophic fracture of rock samples containing a preexisting joint or potential fracture plane is obtained under triaxial compression using a high-speed 32-channel waveform recording system, and the results are discussed with respect to the prediction and characterization of catastrophic fault failure.

TL;DR: In this article, the authors examined two effects of the presence of clay in brittle deformations: the reduction in frictional strength and the impediment of across-fault fluid flow, and they showed that the decrease in the friction coefficient of a gouge with increasing clay content was not simple, but showed a sharp drop at 50 vol.% clay content.

TL;DR: In this paper, the authors measured the failure strength of granitic and andesite samples under various conditions of strain rate and confining pressure both in the dry and wet states.

TL;DR: In this paper, shear-sliding tests were conducted on a serpentine gouge to understand the rheology of antigorite-bearing faults and the transient response in frictional behavior following stepwise changes in the slip velocity were documented at each temperature.

TL;DR: In this paper, water was injected into a cylindrical granite sample subjected to 40 MPa confining pressure and constant axial stress equal to about 70% of short-term dry strength.