JAKARTA (AFP) - A strong 6.0-magnitude earthquake struck off the Indonesian island of Java Sunday, the United States Geological Survey reported, but local officials said there was no risk of a tsunami.

The quake struck at 2.05pm local time (3.05pm Singapore), 93km south of Krajan Tambakrejo village in east Java province at a depth of 59km, the USGS said.

Mochammad Riyadi, from the Indonesian meteorology, climatology and geophysics agency, said there were no reports of casualties or damages.

"The quake epicentre was in the sea, but there's no risk of a tsunami. It's quite a distance from nearby cities," he told AFP.

An AFP correspondent in Banyuwangi city in east Java said that mild shaking could be felt for about five seconds.

Indonesia sits on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent seismic and volcanic activity.