A magnitude-7.7 earthquake hit off the coast of eastern Indonesia in the Flores region, the United States Geological Survey reported on Friday.There was no immediate information available from authorities about possible damage from the quake.Indonesia, a vast archipelago of more than 17,000 islands, is prone to earthquakes and volcanic activity because of its location on the “Ring of Fire,” an arc of volcanoes and fault lines in the Pacific Basin.The latest quake comes after a 7.4-magnitude earthquake rocked western Colombia on Monday, causing widespread damage.In June, deadly back-to-back earthquakes, with magnitudes of 7.2 and 7.5, killed more than 6,000 people in Venezuela, according to government figures.This is a developing story. Please check back for updates.