Ultrasonic transmission measurements from six boreholes from the STIMTEC experiment, Reiche Zeche Mine, Freiberg (Saxony, Germany)

Cite as:

Boese, Carolin M.; Kwiatek, Grzegorz; Fischer, Thomas; Plenkers, Katrin; Starke, Juliane; Blümle, Felix; Dresen, Georg; Janssen, Christoph (2021): Ultrasonic transmission measurements from six boreholes from the STIMTEC experiment, Reiche Zeche Mine, Freiberg (Saxony, Germany). GFZ Data Services. https://doi.org/10.5880/GFZ.4.2.2021.002

Status

I N R E V I E W : Boese, Carolin M.; Kwiatek, Grzegorz; Fischer, Thomas; Plenkers, Katrin; Starke, Juliane; Blümle, Felix; Dresen, Georg; Janssen, Christoph (2021): Ultrasonic transmission measurements from six boreholes from the STIMTEC experiment, Reiche Zeche Mine, Freiberg (Saxony, Germany). GFZ Data Services. https://doi.org/10.5880/GFZ.4.2.2021.002

Abstract

Between early 2018 and late 2019 the STIMTEC hydraulic stimulation experiment was performed at ca.~130 m below surface at the Reiche Zeche underground research laboratory in Freiberg, Saxony/Germany. The project aimed at gaining insight into the creation and growth of fractures in anisotropic and heterogeneous metamorphic gneiss, to develop and optimise hydraulic stimulation techniques and to control the associated induced seismicity under in situ conditions at the mine-scale. These aspects of failure and associated seismicity are important for the development of enhanced geothermal energy systems.

A combined seismic network consisted of 12 single-component acoustic emission sensors (sensitivity 1-100 kHz) and three single-component Wilcoxon accelerometers (sensitivity 50 Hz-25 kHz) were installed in boreholes drilled into the test volume, surrounding the stimulation site (Figure 1). A stimulation borehole with 63 m length was drilled with 15° northward inclination.

This data set of 314 active ultrasonic transmission (UT) measurements is supplementary to Boese et al. (2021), which introduces the STIMTEC experiment and its active measurement campaigns. This data set was used to derive an anisotropic velocity model for the STIMTEC rock volume. The active seismic data provided here are from six boreholes (BH09, BH10, BH12, BH15, BH16, BH17) as shown in Figure 1. of the associated data description.

There are three tables provided as metadata that contain the STIMTEC sensor coordinates, event information of the 314 UT measurements and the UT picks. The UT measurements were recorded with a sampling rate of 1 MHz and results from an automatic stack of 1024 UT pulses generated by the ultrasonic transmitter and recorded by the STIMTEC sensors.

The UT measurements are saved in binary file format (fsf file format). Fsf-files can be processed with FOCI software: https://www.induced.pl/software/foci. Each fsf file contains 32768 samples, which corresponds to 0.032768 seconds. All UT event files were manual inspected and phase arrivals identified. These are stored in the fsf-file header as well as in the table STIMTEC_UT_picks.csv.

Authors

Boese, Carolin M.;GFZ German Research Centre for Geosciences, Potsdam, Germany
Kwiatek, Grzegorz;GFZ German Research Centre for Geosciences, Potsdam, Germany
Fischer, Thomas;GmuG mbH Bad Nauheim, Bad Nauheim, Germany
Plenkers, Katrin;SCCER-SoE ETH Zurich, Zurich, Switzerland
Starke, Juliane;GFZ German Research Centre for Geosciences, Potsdam, Germany
Blümle, Felix;ASIR Seismic
Dresen, Georg;GFZ German Research Centre for Geosciences, Potsdam, Germany
Janssen, Christoph;GFZ German Research Centre for Geosciences, Potsdam, Germany

Contact

Boese, Carolin M. (Research Assistent); GFZ German Research Centre for Geosciences, Potsdam, Germany;

Funders

Bundesministerium für Bildung und Forschung: Verbundvorhaben STIMTEC (03G0874C)

Keywords

Ultrasonic transmission, Acoustic emission sensor, velocity calibration

GCMD Science Keywords

EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES > SEISMIC PROFILE > SEISMIC BODY WAVES
In Situ/Laboratory Instruments > Magnetic/Motion Sensors > Accelerometers > ACCELEROMETERS

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