Acoustic emission source parameters of laboratory triaxial stick-slip experiments on two Westerly granite samples

Blanke, Aglaja; Goebel, Thomas; Kwiatek, Grzegorz;

2020-11 || GFZ Data Services

These data are supplementary to the GJI research article of Blanke et al. 2020, in which static stress drop estimates of laboratory acoustic emission (AE) waveform records were analyzed. Stick-slip experiments were conducted on two triaxial loaded Westerly Granite samples of different roughness: 1) a smooth saw-cut fault (sample S12) and 2) a rough fault (sample W5). Both experiments resulted in six stick-slip failures of which five were analyzed for each fault. A variant of the spectral ratio technique was applied to find the best fitting source parameters.


Laboratory Experiments:

Acoustic emission waveform data of two triaxial stick-slip experiments was recorded at room temperature on cylindrical oven-dried Westerly Granite samples of 105-107 mm height and 40-50 mm diameter. The experiments were conducted on a smooth saw-cut (sample S12) and a rough fault (sample W5). Both experiments were performed in a servo-controlled MTS loading frame equipped with a pressure vessel. The acoustic emission activity was monitored by 16 piezoceramic transducers with a resonance frequency of about 2 MHz. A transient recording system (DAX-Box, Prökel, Germany) recorded full waveform data in triggered mode at a sampling frequency of 10 MHz and an amplitude resolution of 16 bits. The rough fault W5 was first prepared with Teflon-filled saw-cut notches at 30° inclination to the vertical axis and then fractured at 75 MPa. Then, each sample, S12 and W5, was subjected to constant confining pressure of 133 MPa and 150 MPa and then loaded in axial compression using a strain rate of 3*10-4 mm/s and 3*10-6 mm/s, respectively.

Data description:

The tables 2020-008_Blanke-et-al_S1_S12.txt and 2020-008_Blanke-et-al_S2_W5.txt contain AE locations and occurrence, and source parameter estimates of the smooth fault S12 and the rough fault W5, respectively. Both column headers show coordinates of AE locations (X, Y, Z [mm]), temporal occurrence (t [sec]), seismic moment (M0 [Nm]), corner frequency (f0 [Hz]), source radius (r [mm]), static stress drop (stress drop [MPa]), and moment magnitude (MW). M0 and f0 were estimated from the amplitude spectra, using the spectral ratio technique. The source radii were calculated for S-waves using the dynamic circular source model of Madariaga (1976). Static stress drops were estimated following Eshelby (1957). Both tables are used and displayed in Blanke et al. (2020).

Originally assigned keywords

Corresponding MSL vocabulary keywords

MSL enriched keywords

Originally assigned sub domains
  • rock and melt physics
MSL enriched sub domains
  • rock and melt physics
  • analogue modelling of geologic processes
  • geochemistry
Source http://doi.org/10.5880/GFZ.4.2.2020.008
Source publisher GFZ Data Services
DOI 10.5880/GFZ.4.2.2020.008
License CC BY 4.0
Authors
  • Blanke, Aglaja
  • 0000-0001-5252-965X
  • GFZ German Research Centre for Geosciences, Potsdam, Germany
  • Goebel, Thomas
  • 0000-0003-1552-0861
  • Center for Earthquake Research & Information, University of Memphis, Memphis, US
  • Kwiatek, Grzegorz
  • 0000-0003-1076-615X
  • GFZ German Research Centre for Geosciences, Potsdam, Germany
References
  • References
  • The determination of the elastic field of an ellipsoidal inclusion, and related problems. (1957). Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 241(1226), 376–396. https://doi.org/10.1098/rspa.1957.0133
  • 10.1098/rspa.1957.0133
  • References
  • Kwiatek, G., Plenkers, K., & Dresen, G. (2011). Source Parameters of Picoseismicity Recorded at Mponeng Deep Gold Mine, South Africa: Implications for Scaling Relations. Bulletin of the Seismological Society of America, 101(6), 2592–2608. https://doi.org/10.1785/0120110094
  • 10.1785/0120110094
  • References
  • Kwiatek, G., Bulut, F., Bohnhoff, M., & Dresen, G. (2014). High-resolution analysis of seismicity induced at Berlín geothermal field, El Salvador. Geothermics, 52, 98–111. https://doi.org/10.1016/j.geothermics.2013.09.008
  • 10.1016/j.geothermics.2013.09.008
  • References
  • References
  • Blanke, A., Kwiatek, G., Goebel, T. H. W., Bohnhoff, M., & Dresen, G. (2020). Stress drop–magnitude dependence of acoustic emissions during laboratory stick-slip. Geophysical Journal International, 224(2), 1371–1380. https://doi.org/10.1093/gji/ggaa524
  • 10.1093/gji/ggaa524
  • IsSupplementTo
Contact
  • Blanke, Aglaja
  • GFZ German Research Centre for Geosciences, Potsdam, Germany
  • a_blanke@gfz-potsdam.de
Citation Blanke, A., Goebel, T., & Kwiatek, G. (2020). Acoustic emission source parameters of laboratory triaxial stick-slip experiments on two Westerly granite samples [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.4.2.2020.008