Earthquakes rattled Greece’s volcanic island of Santorini every few minutes overnight and into Wednesday as authorities bolstered emergency plans in case the hundreds of temblors over the past few

A rare geological phenomenon causing more than 500 earthquakes in the Aegean Sea has raised eyebrows in Athens, with scientists trying to understand what is really happening and politicians examining the economic impact on landmark tourist destinations.

The strongest earthquake recorded was magnitude 4.6 at 3:55 p.m. Sunday, at a depth of 14 kilometers (9 miles), the Athens Geodynamic Institute said.