MANILA, Philippines (November 3, 2012)--A strong earthquake that rattled a southern Philippine island Saturday, but there were no immediate reports of injuries or damage.

The Mindanao quake was measured at magnitude-6.5 by Philippine authorities while the U.S. Geological Survey said it was a 6.4.

No tsunami warning was issued.

A civil defense official says the quake was strong, but deep underground.

Several aftershocks were recorded.

The Philippine archipelago is in the Pacific "Ring of Fire," where earthquakes and volcanic activity are common.

A magnitude-7.7 quake killed nearly 2,000 people on the northern island of Luzon in 1990.