The figure shows the spatial distribution of the microseismicity that occurred in 10 temporally staggered intervals and spatially isolated stimulation zones and led to permanent microcracks in the granite rock.

The stimulations were carried out by Geo-Energie Suisse AG at the Bedretto Laboratory of ETH Zurich in November and December 2020.

The video shows the development of microseismicity on the time axis that occurred in 10 temporally staggered intervals and spatially isolated stimulation zones and led to permanent microcracks in the granite rock.

The stimulations were carried out by Geo-Energie Suisse AG in the Bedretto Laboratory of the ETH Zurich in November and December 2020.

The video shows the spatial distribution of the microseismicity that occurred in 10 temporally staggered intervals and spatially isolated stimulation zones and led to permanent microcracks in the granite rock.

The stimulations were carried out by Geo-Energie Suisse AG in the Bedretto Laboratory of ETH Zurich in November and December 2020.

The figure shows a method developed by ETH Zurich to predict seismicity during hydraulic stimulations. The method was successfully used in November and December 2020 in the Bedretto Laboratory of ETH Zurich as part of the demonstration project for the multi-stage stimulation concept of Geo-Energie Suisse AG.

The video shows the opening of the ST1 borehole at a depth of 265 (of 400) metres. The water permeability of the water-bearing fissures (transmissivity) visibly increases: despite three activated suction pumps, the bottom of the borehole is flooded.

Natural fissure in the compact granite of the Gotthard massif in the Bedretto Laboratory of the ETH Zurich. Visible in the wall of the access tunnel of the laboratory.

Installation of a seismometer chain in the borehole ST1 for monitoring the stimulations in the borehole ST2, in the Bedretto Laboratory of the ETH Zurich. The work was carried out under the direction of Geo-Energie Suisse.

Installation of a seismometer chain in the ST1 borehole to monitor the stimulations in the ST2 borehole, in the Bedretto laboratory of the ETH Zurich. The work was carried out under the direction of Geo-Energie Suisse SA.

Installation of packers to isolate the stimulation intervals in the ST2 borehole in the Bedretto laboratory of the ETH Zurich. The work was carried out under the direction of Geo-Energie Suisse.

Installation of packers to isolate the stimulation intervals in the ST2 well in the Bedretto laboratory of the ETH Zurich. The work was carried out under the direction of Geo-Energie Suisse.

Installation of innovative measuring equipment to monitor and control the induced microseismicity.

Evaluation of seismic data in the Bedretto laboratory at ETH Zurich.

Evaluation of seismic data in the Bedretto laboratory at ETH Zurich.