An earthquake with magnitude of 5.1 rocked eastern parts of Indonesia on Thursday, no initial report of damage or casualty, Meteorology and Geophysics Agency said here.

The quake hit at 15:06 Jakarta time (0806 GMT) with epicenter at 210 kms southwest Saumlaki of Maluku province and at 87 kms in depth, the agency said.

Indonesia with over 230 million population is laid on a vulnerable quake-hit zone so called the Pacific Ring of Fire, where two continental plates stretching form Western hemisphere to Japan meet, a cause often triggers seismic and volcanic movements.

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