Seismicity
Minimisation of induced seismicity thanks to new technology
The innovative multi-stage stimulation system from Geo-Energie Suisse AG was designed with the aim of reducing induced seismicity to an absolute minimum. The step-by-step approach allows constant monitoring of seismic events and thus the adjustment of the work, right up to a complete stop of the stimulation.
Project-specific seismic monitoring
A system for monitoring seismic activity is planned and set up at each project site. This is to record the precise localisation and magnitude of seismic events for control purposes.
Measuring stations for seismic monitoring
The monitoring system will be set up within a few kilometres of the project site. It consists of several measuring stations with boreholes up to 300 m deep. The measuring instruments are sunk into the boreholes to protect them from external interference such as surface noise and vibrations close to the surface.
The monitoring system planned by Geo-Energie Suisse AG is being reviewed by specialists from the Swiss Seismological Service and finalised as part of the environmental impact report.
Traffic light system
The measuring stations enable real-time observation and monitoring, particularly of the imperceptible induced seismicity at depth. The measuring system is connected to a traffic light control system. The individual limit values always include a safety buffer. At a magnitude of 2.0, which is well below the damage range, the traffic light turns red and work on the project is temporarily stopped (image source: Q-con).
Evidence preservation concept
In advance of the project work, a comprehensive, project-specific evidence preservation concept is developed.
Objectives of evidence preservation:
- Create transparency and provide proactive information
- Ensure swift claims settlement in the event of an unexpected claim
- Secure evidence of actual emissions
- Clearly regulate the claims process
- Focus on the larger risks while maintaining proportionality
Law: Evidence preservation concept using the example of the Etzwilen project.
