Precursory localization and development of microfractures along the ultimate fracture plane in amphibolite under triaxial creep

Authors

Takashi Satoh, Geological Survey Of Japan
Shivakumar Karekal, National Institute of Rock MechanicsFollow
Osamu Nishizawa, Geological Survey Of Japan
K Kusunose, Geological Survey Of Japan

RIS ID

103530

Publication Details

Satoh, T., Karekal, S., Nishizawa, O. & Kusunose, K. (1996). Precursory localization and development of microfractures along the ultimate fracture plane in amphibolite under triaxial creep. Geophysical Research Letters, 23 (8), 865-868.

Abstract

In a triaxial creep experiment in amphibolite, we clearly found a precursorylo calizationa nd developmento f microfracturesa long the final fracture planeu singa n AE (acoustice missions) ourcelo cation technique.T he precursorylo calizationo f AE hypocenters first nucleatedn ear a pre-existingm acroscopidc efecta ndt hene xtendedg raduallya longt hef inalf racture plane prior to failure. On the other hand, no significant precursorylo calizationo f AE hypocenteros n the final fracture plane before failure has been reported in rock samplesf ree of pre-existingm acroscopidce fects. This differencein AE occurrencep atterns beforef ailure could be explainedb y the differencein the degreeo f damage in the portion of the rock surrounding the localization zone when it nucleates.