Heightened seismic activity was recorded over the last few hours in southern Crete. Since 2:00 on Tuesday, when there was a moderate quake measuring 5.2 on the Richter scale with an epicentre in the sea 77 km south of  seaside village of Arvi and until 8:00, the Geodynamic Institute of Athens has recorded over 10 tremors measuring between 3 and 3.9 Richter.