( CNN ) -- An earthquake struck off the Indonesian island of Bali early Thursday , rattling buildings and sending dozens to hospitals with minor injuries . The 6.0-magnitude quake hit 100 km ( 62 miles ) southwest of Bali , the U.S. Geological Survey said . At least 43 people were taken to local hospitals , including five who suffered serious injuries , medical officials said . A few suffered broken bones and are undergoing treatment , said Wayan Sudanti , an official at a local hospital . Another medical official at a nearby hospital said several others were undergoing treatment for minor injuries , but did not specify how many . The quake had a depth of 38 miles , and no tsunami alert was issued , according to the U.S. Geological Survey . Indonesia is on the so-called Ring of Fire , an arc of fault lines circling the Pacific Basin that is prone to frequent earthquakes and volcanic eruptions . In 2004 , a 9.1-magnitude underwater earthquake struck off the coast of Sumatra , triggering a tsunami that killed more than 200,000 people in 14 countries . The tsunami , which washed away entire communities , caused nearly $ 10 billion in damage and more casualties than any other tsunami in history , according to the United Nations . Indonesia was among the hardest hit nations .
NEW : Dozens of injuries reported , medical officials say . Comment: The 6.0-magnitude quake hits southwest of Bali .