6.1-magnitude quake jolts Indonesia, no tsunami alert issued

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".