JAKARTA, Indonesia (CNN) -- An earthquake with a preliminary magnitude of 7.9 struck Indonesia on Wednesday, the U.S Geological Survey said.
The quake was recorded about 33 miles from Padang, Sumatra.
The Pacific Tsunami Warning Center of the National Oceanic and Atmospheric Administration (NOAA) issued a tsunami watch for Indonesia, India, Thailand and Malaysia.
NOAA could not immediately say whether the quake generated a tsunami, but such advisories are issued when a quake has the potential to cause one.
On Tuesday, a magnitude 8.0 quake -triggered tsunami killed at least 84 in the Samoan islands and Tonga.