A strong earthquake shook western Greece on Friday morning. According to initial measurements by the Greek Geodynamic Institute in Athens, it had a magnitude of 5.8 and occurred at 9:12 am (0812 GMT) local time. The epicentre of the quake was about 20 kilometres below the seabed off the west coast of the Peloponnese peninsula near the islet of Stamfani (also known as Strofades). It was preceded by a smaller quake with a magnitude of 4.1. Greece’s Civil Defence organization did not initially say whether there were any casualties or damage to buildings. A tsunami warning was not issued. “We felt…