The research performed by the group involves laboratory and in-situ experiments carried out with state of the art seismic acquisition equipment. Data is analyzed and visualized with sophisticated processing software and numerical models are often generated for enhanced interpretation and understanding of the relevant physical processes. Below are listed some of the resources of the research group. Click on the links for more information.Rock Deformation Equipment Table Mounted Testing Equipment High Precision, High Pressure Syringe Pumps Acoustic Emission Sensors and Preamplifiers High Speed Data Acquisition Systems Seismic Processing Software Numerical Modelling Software Computer Cluster
- Acoustic Emission Calibration Apparatus
- Tomography Scanning System
- Azimuthal Velocity Measurement System
Acoustic Emission Calibration Apparatus
We employed the same calibration scheme as Manthei & McLaskey and Glaser to calibrate the EgoTech MkII transducer. A glass capillary fracture source was used on the surface of an Aluminum plate and waveforms were recorded at two location. Position 1 is on the same side of the plate as the source and position 2 is directly opposite the source (epicentral location).
An overhead view of the tomographic scanning system.
Example slowness and anisotropy tomograms for a thermal loading test on Lac du Bonnet granite.
Tomography Scanning System
Tomographic data can be acquired for large rock samples in the laboratory using an automated scanned transducer system. The system uses precision stepper motors to position four moveable arms to any required source/receiver positoon on the tomographic plane. Transducers at the ends of the arms are spring loaded against the sample faces for good coupling and are protected by hemispherical brass caps which facilitate sliding. The scanned transducer system allows significantly denser ray path coverage than is usually feasible with a fixed transducer array.
The transducers are 12.5-mm-diameter Panametrics V103 longitudinal wave transducers with a nominal centre frequency of 1.0 MHz. A Panametrics 5055PR pulser is used to generate the signals at the transmitters. Signals at the receivers are amplified by 60 dB with Cooknell CA-6 charge amplifiers and digitised with a Nicolet 4570B four-channel, 12-bit, 10 MHz digital oscilloscope.
Azimuthal Velocity Measurement System
Equipment is available to accurately determine the azimuthal variation in the elastic properties of rock cores.