Update: A small tsunami (17cm) is reported to be heading towards the Aceh coast but the US Geological Survey believes the risk for a large tsunami is small. A tsunami “warning” is in effect in Sri Lanka and the eastern coast of India. Tremors were felt 1500km away across Southern India; in Chennai, Bangalore and Thiruvananthapuram among many other cities.
Indonesia issued a tsunami warning Wednesday after an earthquake with a preliminary magnitude of 8.7 hit waters off westernmost Aceh province. tremors were felt in Singapore, Thailand, Malaysia and India. High-rise apartments and offices on Malaysia’s west coast shook for at least a minute.
The Pacific Tsunami Warning Center in Hawaii said a tsunami watch was in effect for Indonesia, India, Sri Lanka, Australia, Myanmar, Thailand, the Maldives and other Indian Ocean islands, Malaysia, Pakistan, Somalia, Oman, Iran, Bangladesh, Kenya, South Africa and Singapore. …
A giant 9.1-magnitude quake off the country on Dec. 26, 2004, triggered a tsunami in the Indian Ocean that killed 230,000 people, nearly three quarter of them in Aceh.
Interestingly the Piers Corbyn’s March forecast for extreme weather (based on solar activity) had identified 8th – 10th April as being especially prone to severe earthquake or volcanic activity.

extract from the Piers Corbyn March Earthquake & Major Volcano Red Warning chart published in March, the period 8th - 10th April was highlighted as a Top Red Warning (R4) period