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Metadata Files

Data Publication

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

Blanke, Aglaja | Goebel, Thomas | Kwiatek, Grzegorz

GFZ Data Services

(2020)

Descriptions

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).
A variant of the spectral ratio technique (e.g. Kwiatek et al., 2011; 2014) was applied to estimate source parameters, e.g. corner frequency, seismic moment, source size and relative static stress drop. The point-source model of Boatwright (1978) was used to fit the spectra. First, AE events were grouped to large AE event populations according to stick-slip cycles. Then, spectral ratios were computed for each group based on linked AE event pairs. Event pairs had to meet quality aspects (cf. Blanke et al., 2020) to maximize the empirical Green’s function (eGf) criteria. The linking of several AE events allowed to have multi-eGfs for each single AE event. A Simulated Annealing approach based on non-stationary Metropolis-Hastings Random Walk algorithm was applied to solve the multidimensional inversion problem.

Keywords


Originally assigned keywords
seismology
earthquake source
laboratory acoustic emission
static stress drop
source parameters
spectral ratio
Westerly granite
triaxial
stick-slip
laboratory experiment
stick-slip failure
scaling relations
stress drop dependence
slip-controlled
scale-invariant
scale-dependent
multi-scale
cross-scale
scaling breakdown
mechanical stress drop
multi-empirical Green's functions
magnitude
seismic moment
corner frequency
source radius
EPOS
European Plate Observing System
multi-scale laboratories
rock and melt physical properties
analysis > data analysis
EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES
experiment > laboratory experiment
research > scientific research > laboratory research

Corresponding MSL vocabulary keywords
acoustic emission (AE)
acoustic emission (AE)
Westerly granite
shear testing
rate and state friction (RSF) parameters
rate and state friction (RSF) parameters

MSL enriched keywords
Measured property
acoustic emission (AE)
Measured property
acoustic emission (AE)
igneous rock - intrusive
acidic intrusive
granite
Westerly granite
Apparatus
deformation testing
shear testing
friction - controlled slip rate
rate and state friction (RSF) parameters
friction - controlled slip rate
rate and state friction (RSF) parameters
compression testing
confining pressure vessel
triaxial compression apparatus
conventional triaxial apparatus: saw-cut
stress drop
strain
stress drop
strain

MSL enriched sub domains i

rock and melt physics
analogue modelling of geologic processes

Source

https://dataservices.gfz-potsdam.de/panmetaworks/showshort.php?id=925899dd-2049-11eb-9603-497c92695674

Source publisher

GFZ Data Services


DOI

10.5880/gfz.4.2.2020.008


Creators

Blanke, Aglaja

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0001-5252-965X

Goebel, Thomas

Center for Earthquake Research & Information, University of Memphis, Memphis, US

ORCID:

https://orcid.org/0000-0003-1552-0861

Kwiatek, Grzegorz

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0003-1076-615X


Contributors

Blanke, Aglaja

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0001-5252-965X

Kwiatek, Grzegorz

Supervisor

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0003-1076-615X

Blanke, Aglaja

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany


References

https://pubs.geoscienceworld.org/ssa/bssa/article/68/4/1117/117843/

10.1098/rspa.1957.0133

10.1785/0120110094

10.1016/j.geothermics.2013.09.008

https://pubs.geoscienceworld.org/ssa/bssa/article/66/3/639/117579

10.1093/gji/ggaa524


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


Dates

Issued:

2020


Rights

Creative Commons Attribution 4.0 International