(CNN) -- A magnitude-6.7 earthquake struck off the coast of Indonesia early Monday, the U.S. Geological Survey reported.

The Pacific Tsunami Warning Center issued an alert notifying authorities of "a very small possibility of a local tsunami that could affect coasts located usually no more than 100 kilometers (62 miles) from the earthquake epicenter."

The quake's epicenter was located 149 miles (240 kilometers) east-northeast of Christmas Island at a depth of 14.9 miles, USGS said.