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false4DOIDB.GFZ 10.5880/GFZ.4.2.2021.002 Boese, Carolin M. Carolin M. Boese 0000-0002-2383-2219 GFZ German Research Centre for Geosciences, Potsdam, Germany Kwiatek, Grzegorz Grzegorz Kwiatek 0000-0003-1076-615X GFZ German Research Centre for Geosciences, Potsdam, Germany Fischer, Thomas Thomas Fischer GmuG mbH Bad Nauheim, Bad Nauheim, Germany Plenkers, Katrin Katrin Plenkers 0000-0002-7739-2554 SCCER-SoE ETH Zurich, Zurich, Switzerland Starke, Juliane Juliane Starke 0000-0002-0377-6512 GFZ German Research Centre for Geosciences, Potsdam, Germany Blümle, Felix Felix Blümle 0000-0001-7711-3976 ASIR Seismic Dresen, Georg Georg Dresen 0000-0002-3737-2858 GFZ German Research Centre for Geosciences, Potsdam, Germany Janssen, Christoph Christoph Janssen 57196350671 GFZ German Research Centre for Geosciences, Potsdam, Germany GFZ Data Services 2021 Ultrasonic transmission Acoustic emission sensor velocity calibration EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES > SEISMIC PROFILE > SEISMIC BODY WAVES In Situ/Laboratory Instruments > Magnetic/Motion Sensors > Accelerometers > ACCELEROMETERS Boese, Carolin M. Carolin M. Boese 0000-0002-2383-2219 GFZ German Research Centre for Geosciences, Potsdam, Germany Boese, Carolin M. Carolin M. Boese 0000-0002-2383-2219 GFZ German Research Centre for Geosciences, Potsdam, Germany Kwiatek, Grzegorz Grzegorz Kwiatek 0000-0003-1076-615X GFZ German Research Centre for Geosciences, Potsdam, Germany Fischer, Thomas Thomas Fischer GmuG mbH Bad Nauheim, Bad Nauheim, Germany Plenkers, Katrin Katrin Plenkers 0000-0002-7739-2554 SCCER-SoE ETH Zurich, Zurich, Switzerland Plenkers, Katrin Katrin Plenkers 0000-0002-7739-2554 SCCER-SoE ETH Zurich, Zurich, Switzerland Starke, Juliane Juliane Starke 0000-0002-0377-6512 GFZ German Research Centre for Geosciences, Potsdam, Germany Blümle, Felix Felix Blümle 0000-0001-7711-3976 ASIR Seismic Dresen, Georg Georg Dresen 0000-0002-3737-2858 GFZ German Research Centre for Geosciences, Potsdam, Germany Janssen, Christoph Christoph Janssen 57196350671 GFZ German Research Centre for Geosciences, Potsdam, Germany Boese, Carolin M. GFZ German Research Centre for Geosciences, Potsdam, Germany 2018-06-29/2019-12-05 Dataset 10.5194/se-13-323-2022 https://www.induced.pl/software/foci CC BY 4.0 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.

STIMTEC underground research lab, 2nd floor Reiche Zeche Mine, Freiberg, saxony, Germany 13.3507 13.3513 50.9247 50.9254 Bundesministerium für Bildung und Forschung http://doi.org/10.13039/501100002347 03G0874C Verbundvorhaben STIMTEC