Jakarta,  An earthquake measuring 6.1 on the Richter scale rocked Indonesia's western Central Java province on Tuesday morning, the meteorology and geophysics agency said. It, however, did not issue a warning for tsunami.

The quake struck at 5.54 a.m. with the epicentre at 53 km northwest Jepara of the province and a depth of 578 km under the sea bed, Xinhua reported.

Indonesia has been frequently jolted by earthquakes as it lies on a vulnerable quake-hit zone called "the Pacific Ring of Fire".