NEW : Two people killed ; several people trapped beneath collapsed buildings . Strong earthquake measuring Two hit southern Patras . Epicenter was about 80 miles southwest of port city of Greece . The temblor struck around 3:30 p.m. [ 8:30 a.m . ET ] and measured 6.1 in magnitude , according to the U.S. Geological Survey . Athens -- about 20 miles east of the epicenter -- felt the ground shake .
NEW : Two people killed ; several people trapped beneath collapsed buildings . Strong earthquake measuring Two hit southern Patras . Epicenter was about 80 miles southwest of port city of Greece . Athens -- about 20 miles east of the epicenter -- felt the ground shake .