The whole area is under tsunami alert and a watch has been issued for countries across the Indian Ocean.
BBC News - Indonesia Aceh quakes triggers Indian Ocean tsunami alert
Scary stuff. I'm from India, even though I don't live there and most of my extended family is safe away from coastal cities. Nevertheless waves are expected to hit many cities around the coast. There's chaos in Indonesia as well.
Although reports say that there was no vertical displacement of water, virtually ruling out the possibility. But apparently coasts in Indonesia are experiencing low tides which is usually the first sign of a Tsunami.
I remember how scary it was back in 2004 when it last happened. Keep your thoughts and prayers with the people of Indonesia. :/