Some 10,000 people have been evacuated on the Indonesian island of Lombok after a powerful 6.9 magnitude quake on Sunday left nearly 100 people dead.
Witnesses spoke of chaos and terror, with thousands of buildings damaged, and power and communication lines cut.
Boats have been sent to evacuate more than 1,000 tourists from the nearby Gili islands.
Aid agencies said the priority was to provide shelter for residents too scared to return to their homes.
The agencies said the impact was far bigger than another quake that hit Lombok last week, killing 16 people.
President Joko Widodo urged the speedy evacuation of casualties, calling for more flights to be sent to the affected areas.
What’s the latest on Lombok?
Sutopo Purwo Nugroho, a spokesman for the Indonesian Disaster Management Agency, said that the northern area of Lombok had suffered massive damage.
Three C-130 Hercules aircraft and two helicopters have been deployed to deliver tents and medical aid, but the earthquake has brought down roads and bridges, making areas difficult to reach.
Electricity supply in the worst-affected areas has been cut off and telecommunication networks are not working.
The death toll stands at 98, all Indonesians, but Mr Sutopo said that number would “definitely increase”. At least another 236 people have been injured.
He pointed to the situation at a collapsed mosque in the village of Lading-Lading in north Lombok, where a lack of heavy lifting equipment had made it difficult to locate victims.
One official said 80% of north Lombok had suffered damage.
The main city of Mataram was also badly affected, with medical staff struggling to cope with the injured at the damaged hospitals.
What about the Gili islands?
Situated off the north-west of Lombok and popular with backpackers and divers, they were badly hit, with a number of hotels damaged.
Video and still images showed hundreds of tourists flocking to the beach to be evacuated.
There have been reports of deaths on the islands but these have not been confirmed.
Hundreds of tourists have been taken off by boat, but hundreds still remain.