SYMPOSIA PAPER Published: 01 January 1991

Microseismics and Geotechnical Applications


AE events in the low frequency range (⟨1 kHz) are sometimes referred to as microseismic activity. In microseismics and geotechnical applications, higher frequency components are preferentially attenuated. The detection of low frequency components can minimize the effect of material inhomogeneity. So far, quantitative treatment of AE in geotechnical fields is limited to the, source location analysis. In the present paper, a source inversion procedure in geologic materials is discussed. The procedure consists of the SiGMA (simplified Green's function for a moment tensor analysis) inversion to determine moment tensor components and the unified decomposition of the eigenvalues to characterize crack types and crack orientations. AE sources are classified into tensile cracks and shear cracks, and crack orientations are determined from the directions of the eigenvectors. As an application, AE events observed in a hydrofracturing test are analyzed. Results show a great promise of AE for clarifying failure mechanisms in geotechnical fields.

Author Information

Ohtsu, M
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E07
Pages: 347–357
DOI: 10.1520/STP19105S
ISBN-EB: 978-0-8031-5160-4
ISBN-13: 978-0-8031-1389-3