JAKARTA, June 12 (Xinhua) -- A 6.3-magnitude earthquake rocked off the south coast of Indonesia's most-populated Java Island Monday morning, the Indonesian Meteorological, Climatological and Geophysical Agency said.

No casualties or damage have been reported so far.

The quake struck at 6:15 Jakarta time (2315 GMT Sunday). The epicenter was 179 km southwest of West Java province's Sukabumi City with a depth of 10 km under the sea.

Indonesia's National Disaster Mitigation Agency (BNPB) said on its official twitter account that the quake was also felt in the country's capital Jakarta more than 200 km north of the epicenter.

The Indonesian Meteorological and Geophysics Agency said there was no potential for tsunami.

The United States Geological Survey (USGS) put the magnitude at 5.6 with a depth of 10 km.

Indonesia sits on the so-called Pacific "Ring of Fire" where several tectonic plates meet, making it vulnerable to frequent earthquakes.