Cephalonia Island is one of the most seismic zones of the Euro‐Mediterranean area due to the activity of the Cephalonia transform fault connecting the Hellenic subduction to the northwest Greece collision. Following the two Mw 6+ earthquakes that occurred in early 2014, a postseismic survey was organized within the framework of the Sinaps@ project near to the city of Argostoli. Different sensor types were deployed for different soil conditions: 5 accelerometers, a dense array of 21 broadband velocimeters, and 1 rotational sensor. The survey implementation and the event dataset preparation are presented here. The very rich aftershock sequence allowed high‐quality recording of thousands of events (signal‐to‐noise ratio >10). These are gathered into three main datasets: the accelerometric dataset (4147 events), the velocimetric dataset (1843 events), and the rotational dataset (1373 events). These events are associated with seismicity catalogs to provide source metadata. Each event benefited from a visual check and a picking of the P‐ and S‐wave arrival times. The datasets are now open and may be used for various studies.

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