The Indonesian Meteorology and Geophysics Agency determined the epicenter was near the island of Pulau Kabaruang, site of a 7.4 magnitude quake on February 12 that injured dozens of people while wrecking hundreds of buildings.
That quake also also triggered a brief tsunami alert that sent residents scrambling into trees and atop buildings.
No such tsunami alert was issued following Monday’s much weaker quake, which struck at 10:15 a.m. local time.