1 of 10
The powerful earthquake that struck off the coast of Sumatra on Monday night has caused extensive devastation.

2 of 10
Roads and runways across the island of Nias have been badly damaged, hampering aid efforts.

3 of 10
Grieving relatives are caring for their loved ones in makeshift hospitals and morgues across the island.

4 of 10
The tremor reignited memories of last December's tsunami and sent residents in nearby Aceh fleeing to higher ground.

5 of 10
People were told to evacuate the main beach in the Indian city of Madras.

6 of 10
Many set off for higher ground, fearing another tsunami like the one that killed so many in December.

7 of 10
In Indonesia's capital, officials recorded the magnitude of the quake, eventually classified as 8.7.

8 of 10
By daybreak, families were struggling to survive without food or water across the shattered island.

9 of 10
In Aceh, devastated by December's tsunami, there were few buildings left to destroy.

10 of 10
Across the Indian Ocean, watchful Sri Lankans remain suspicious of the sea.