JAKARTA - A strong undersea earthquake jolted Indonesia's eastern islands Wednesday morning, but there were no immediate reports of casualties or structural damage done, officials said.

Measuring 6.2 on the Richter scale the quake rocked Ternate and nearby islands on eastern Indonesian province of North Maluku at 0132 GMT, said an official at Jakarta's Meteorology and Geophysics Agency. The quake's epicentre was in the sea, about 228 kilometres northeast of Ternate, the provincial capital of North Maluku, and occurred about 72-kilometres beneath the sea bed, according to the official, who identified herself as Eva.

There were no immediate reports of injury or structural damage from the latest earthquakes to jolt Indonesia in recent weeks.

Indonesia, the world's largest archipelago nation, is prone to earthquakes because of its location on an arc of volcanos and oceanic trenches encircling the Pacific Basin.