Indonesia experiences frequent seismic and volcanic activity due to its position on the Pacific Ring of Fire, where tectonic plates collide.
Last month a shallow 5.6-magnitude tremor hit the town of Cianjur in West Java, killing 331 people, injuring thousands and leaving tens of thousands homeless after it collapsed buildings and triggered landslides.
Many were found buried under rubble in the days following the quake with only several successful rescues reported, including an operation to free a six-year-old boy which was described as a “miracle” by emergency workers.
Residents of the town were shaken again by Saturday’s quake and it caused some roofs to be lightly damaged, local military official Haryanto, who like many Indonesians goes by one name, told local broadcaster Kompas.
“It made us feel like we were swaying. We could see hanging lamps swaying,” he said.
A 6.2-magnitude quake that shook Sulawesi island in January last year killed more than 100 people and left thousands homeless.