New seismic monitoring system for real-time monitoring in the North Sea
Just 20 kilometres off the coast near Hoek van Holland, in the Dutch sector of the North Sea, a groundbreaking seismic monitoring experiment is about to begin. The University of Twente, in collaboration with the CO₂ transport and storage project Porthos, will install a series of maritime seismometers around the P18-A platform. Positioned within a 500-metre radius, these instruments will continuously record vibrations in the seabed. The aim is to gain a clearer picture of underground processes and gather crucial data for ensuring that CO₂ storage beneath the seafloor is both safe and reliable.
The research is part of the DICTUM research project, which focuses on improving the imaging of deep subsurface structures in the Netherlands. Where seismic data is traditionally collected using land-based networks, DICTUM uses sensors directly on the seabed. The short distance to the Porthos CO₂ injection point makes it possible to better perceive subtle signals, which contributes to the early detection of any changes in the subsurface so that they can be acted upon.
Subsurface modelling and geomechanics
The University of Twente is playing a central role in the project and developing techniques to make existing seismic measurement principles suitable for offshore applications. This approach is innovative in the Netherlands and contributes to the development of internationally leading knowledge in the field of subsurface modelling and geomechanics.
Monitoring real-time seismic activity in the dynamic and shallow waters of the North Sea has long been a challenge, as existing sensor technologies simply weren’t up to the task. That is about to change. Researchers at the University of Twente have developed an innovative seismometer system designed specifically to operate under these demanding conditions. This new concept opens the door to local, real-time seismic monitoring in one of the world’s busiest and most complex marine environments. The development of the system has been coordinated by Dr Islam Fadel within the DICTUM project: “This collaboration with Porthos is a unique opportunity to test the new concept, further develop the system, better monitor the area and increase our knowledge of the geology under the North Sea.”
A field test with dummy seismometers at the end of 2024 provided valuable technical insights, such as the effectiveness of the anchor system. These results have been incorporated into the experimental phase, which has started and will run until 2026. If this is successful, the intention is that the maritime seismometers will be an official part of the national KNMI seismological measurement network from 2027.
Monitoring and research play a crucial role in ensuring the safe transport and storage of CO₂. At every stage of the Porthos project, data is collected to generate valuable insights – not only for Porthos but also for future offshore initiatives supporting the energy transition. Although offshore monitoring is not a legal requirement under the current storage permit, Porthos actively supports this type of research, recognizing its value for the development of safe and effective CO₂ storage practices.
