[Geophysical Observatory at the North Anatolian Fault](https://www.gfz.de/en/scientific-infrastructure/research-infrastructures/regional-observatories/geophysical-observatory-at-the-north-anatolian-fault-gonaf) aims at gaining new insights into the physical processes before, during and after a large earthquake, by using a borehole-based seismometer network at the offshore part of Eastern Sea of Marmara (NW Turkey).