A strong earthquake with magnitude of 6.2 rocked eastern part of Indonesia on Thursday, no immediate reports of casualty or potential of tsunami, Indonesian Meteorology and Geophysics Agency said in Jakarta.

The quake jolted at 21:31 Jakarta time with epicenter at 73 kilometers of southwest of Ambon, the capital of Maluku province, at 58 kilometers under sea bed, an official of the agency Bayu Pranata told Xinhua.

The epicenter was located between the Buru island and Ambon island at the province, he said.

The intensity of the quake was felt from 3 to 4 mmi (modified mercally intensity) at Ambon city, said Pranata.

Indonesian is laid on a vulnerable quake-hit zone that called "the Pacific Ring of Fire," where continental plates meet causing frequent seismic and volcanic activities.