Strong quake jolts western Indonesia, no tsunami alert issued

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.

The agency did not issue a warning for tsunami.

The quake struck at 5: 54 am Jakarta time Tuesday (2254 GMT Monday) with the epicenter at 53 km northwest Jepara of the province and a depth of 578 km under the sea bed.

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