A strong undersea earthquake has hit off of Indonesia's main island of Java, but there are no immediate reports of injuries or damage.

The U.S. Geological Survey says the magnitude-6.0 quake that hit Sunday afternoon was centered 93 kilometers (58 miles) south of the East Java province town of Krajan Tambakrejo, at a depth of 59 kilometers (37 miles).

Indonesia is prone to earthquakes due to its location on the so-called Pacific "Ring of Fire."

A massive earthquake off Sumatra island in 2004 triggered a tsunami that killed 230,000 people in a dozen countries, mostly in Indonesia's Aceh province.