Description
Included are experimental data recorded from shear experiments that explore the effects of pore pressure heterogeneity on microseismic character and fault slip timing resulting from shear reactivation of laboratory faults. Raw mechanical and acoustic data from 15 experiments are included alongside two MATLAB scripts (uniform and non-uniform pore pressure profiles) that import and plot the data, as well as use it to calculate shear and normal stress.
Experiments are performed on 2.5-3 inch long granitoid cores from the Utah FORGE EGS demonstration site, containing a single inclined fracture with small-scale roughness added to the fracture surface. The raw data included here were recorded from an aluminum triaxial pressure vessel (TEMCO) configured with three independent servo-controlled pumps, with DI water used as the working fluid. The pumps control confining pressure, upstream pore pressure, and axial pressure, with each pump connected to a LabView interface to record applied pressures, cumulative injected water volumes, and pump flow rates. The downstream outlet from the fracture is closed to allow pressurization, which is measured by an external pressure transducer. A linear variable differential transformer (LVDT) attached to the axial piston measures axial displacement, from which we calculate shear displacement along the fracture. Additionally, P-wave transducers are used to record acoustic signatures, where acoustic emission events and maximum amplitudes are compared against seismic moment and shear slip velocity.
Fluid injection rates range between 0.05 mL/min, 0.25 mL/min, and 0.75 mL/min for each experiment. Triggered shear displacement is used as a proxy for seismic moment and is indexed against cumulative injection volume and rate. Each experiment is performed under constant shear stress conditions, and the sample is fully saturated with DI water. Axial and confining stresses are applied to 3 MPa through pressure-stepping in 500 kPa increments. The pore pressure is held constant at 200 kPa prior to initiating the experiment, and initial axial displacement is recorded. The axial stress is then increased to initiate shear mobilization during the loading phase (run-in) until a peak steady state is achieved. The initial shear stress is reduced to approximately 60, 80, or 90% of the peak shear strength by decreasing the axial stress, then held constant for the duration of each experiment.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| MR14_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| Experiment MR14 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| MR15_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| Experiment MR15 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| MR17_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.25 mL/min at 80% prestress. | Open resource |
| Experiment MR17 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.25 mL/min at 80% prestress. | Open resource |
| MR1_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.25 mL/min at 80% prestress. | Open resource |
| Experiment MR1 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.25 mL/min at 80% prestress. | Open resource |
| MR22_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.25 mL/min at 80% prestress. | Open resource |
| Experiment MR22 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.25 mL/min at 80% prestress. | Open resource |
| MR23_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| Experiment MR23 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| MR2_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.75 mL/min at 80% prestress. | Open resource |
| Experiment MR2 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.75 mL/min at 80% prestress. | Open resource |
| MR3_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| Experiment MR3 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.05 mL/min at 80% prestress. | Open resource |
| MR41_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.75 mL/min at 80% prestress. | Open resource |
| Experiment MR41 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.75 mL/min at 80% prestress. | Open resource |
| MR68_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.05 mL/min at 60% prestress. | Open resource |
| Experiment MR68 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.05 mL/min at 60% prestress. | Open resource |
| MR71_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.25 mL/min at 60% prestress. | Open resource |
| Experiment MR71 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.25 mL/min at 60% prestress. | Open resource |
| MR74_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.75 mL/min at 60% prestress. | Open resource |
| Experiment MR74 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.75 mL/min at 60% prestress. | Open resource |
| MR78_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.75 mL/min at 90% prestress. | Open resource |
| Experiment MR78 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.75 mL/min at 90% prestress. | Open resource |
| MR79_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.25 mL/min at 90% prestress. | Open resource |
| Experiment MR79 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.25 mL/min at 90% prestress. | Open resource |
| MR80_AE_catalog.csv | CSV | Acoustic emissions catalog for constant rate experiment where injection rate was held at 0.05 mL/min at 90% prestress. | Open resource |
| Experiment MR80 - Raw Mechanical Data.txt | Text | Raw data for constant rate experiment where injection rate was held at 0.05 mL/min at 90% prestress. | Open resource |
| NonUniform_PorePressure_RawData_Script.m | Unknown | Script for deducing raw mechanical data for non-uniform pore pressure profiles. | Open resource |
| Uniform_PorePressure_RawData_Script.m | Unknown | Script for deducing raw mechanical data for uniform pore pressure profiles. | Open resource |