A strong earthquake jolted the western island of Kefallonia, authorities said Sunday. Minor damages were reported but no injuries. The Athens Geodynamic Institute said the quake, measuring 5.9 on the Richter scale, occurred at 4:57 p.m. (1957 GMT). Its epicenter was 290 kilometers west of Athens. A series of aftershocks were registered, with the most powerful measuring 4.6. The Ionian island of Kefallonia is located in one of the most earthquake prone areas in Greece.