A tsunami warning is in effect in the Indian Ocean

Highlighted countries are under tsunami watch. Times in GMT indicate expected tsunami arrival.

A tsunami warning is in effect in the Indian Ocean following powerful earthquakes off the coast of Indonesia's Aceh province, prompting evacuations from coastal regions and alarm in areas struck by a devastating wave in 2004. Wednesday's first quake was measured at a magnitude of 8.6, according to the US Geological Survey, which revised down an earlier 8.9 estimate. US seismologists reduced the area under watch for a possible tsunami.