An underwater quake measuring 6.9 on the Richter scale has rocked the island of Sumatra, Indonesia, triggering panic but causing no damage, officials say.
Indonesia's meteorological and geophysical agency said a tsunami was unlikely because the tremor was too far from the earth's surface.
The epicentre was reportedly 50km west of the city of Padang, west Sumatra, and struck at 1205 (0505 GMT).
Locals across the island fled from their homes, but nobody was injured.
"There is no tsunami due to the quake because it was a deep one under the sea," Reuters news agency quoted seismologist Rinto Nadjiono from the quake centre in the capital Jakarta as saying.
"But the shake was felt quite strong in Padang and Nias although there is no report of damage."
Hundreds of residents of the remote island of Nias were killed on 28 March by a 8.7 quake.
Aftershocks have hit Indonesia, particularly Sumatra, since the 26 December quake that triggered a deadly tsunami across the region.
At least 126,000 people died in the country, and some coastal villages in the Aceh province lost more than 70% of their inhabitants.