Seismologists say a strong 5.8-magnitude earthquake has hit the Bali Sea off the northern coast of Indonesia. The US Geological Survey says the quake, which was at a depth of 312 kilometres, struck at 5:00am (local time) about 215 kilometres north of Denpasar in Bali. There has been no immediate tsunami warning from the Pacific Tsunami Warning Centre. Indonesia sits on the Pacific 'Ring of Fire' where continental plates meet, causing frequent seismic and volcanic activity. The archipelagic nation was hardest hit by the earthquake-triggered Asian tsunami in December 2004 that killed an estimated 168,000 people in Indonesia's Aceh province.