A moderate 5.9-magnitude quake struck Indonesia's Sunda Strait early on Sunday, the US Geological Survey said, but no tsunami warning was issued and there were no immediate reports of damage.
The quake struck at 02:26 am (1926 GMT Saturday) at a depth of about 50 kilometres (31 miles). The USGS reported the epicentre was more than 170 kilometres west of the capital Jakarta.
Two massive earthquakes struck off Indonesia's Sumatra island last week, triggering an Indian Ocean-wide tsunami alert and sending terrified people fleeing from the coast.
At a magnitude of 8.6, the first of the two quakes which hit Wednesday was the strongest since the 2004 Indian Ocean tsunami that killed 170,000 in Indonesia's quake-prone Aceh province.
But the tsunami watch on Wednesday was eventually lifted and no major damage was reported.