We just recently published our new study with Virginie Durand as first author, where we investigated the seismicity preceding the occurrence of a M 5.7 event in the Marmara Sea that was widely felt offshore Istanbul. The study has been published in Seismological Research Letters!
The paper can be found at:
And here is the Press release from the GFZ-Potsdam,
Preparation Phase of an Mw 5.8 Earthquake in the Sea of Marmara Offshore Istanbul