An earthquake of magnitude 6.1 on the Richter scale hit 1102 km Southeast of Singapore on Tuesday. According to the National Centre for Seismology, the earthquake struck at 4:24 am. However, the USGS reported a 6.6 magnitude earthquake 93 km North of Batang, Indonesia. However, no tsunami alert was issued and locals in Singapore did not feel any tremors.
It must be noted that Singapore is not located on a plate boundary and is therefore not prone to earthquakes. But big earthquakes occurring on the nearest plate boundary (the Sunda Megathrust, offshore Sumatra) may affect the country.
Location of the earthquake as per USGS