Thousands of tourists and residents have been forced to flee the Indonesian resort island of Lombok after a 6.9 magnitude earthquake struck yesterday.
At least 98 people were killed, and the death toll is expected to rise.
Rescuers have been using diggers and heavy machinery to clear debris and in the search for survivors.
However, the island was further rattled by a magnitude 5.2 earthquake on this evening.
The National Disaster Mitigation Agency (BNPB) said it expected the death toll to rise once the rubble of more than 13,000 houses was cleared away after two powerful quakes in a week.
Power and communications were severed in some areas, with landslides and a collapsed bridge blocking access to areas around the epi centre in the north.
The military said it would send a ship with medical aid, supplies and logistics support.
Indonesia sits on the Pacific Ring of Fire and is regularly hit by earthquakes. In 2004, the Indian Ocean tsunami killed 226,000 people in 13 countries, including more than 120,000 in Indonesia.
Indonesia evacuates thousands after Lombok earthquake kills 98 | https://t.co/RzgdcuK4mS pic.twitter.com/LBRzStQNMQ
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Officials said more than 2,000 people had been evacuated from the three Gili islands off the northwest coast of Lombok, where fears of another tsunami spread.
The Department of Foreign Affairs said that no Irish citizens were among the casualties.
It said: "The Department through the Embassy in Jakarta supporting a number of Irish citizens intending to leave the affected area. We are liaising closely with the Indonesian authorities to seek to ensure all Irish citizens can travel safely.
"The Consul from the Irish Embassy is travelling to Lombok to provide direct support to Irish citizens. The EU has set up a common consulate support centre at Lombok airport and we will continue to monitor the situation."
One tourist told Reuters that people were scrambling to get on boats leaving for the main island during which her husband was injured.
"People were just throwing their suitcases on board and I had to struggle to get my husband on, because he was bleeding," she said.
A BNPB spokesman said emergency units in its hospitals were overflowing and some patients were being treated in parking lots.
The main hospital in the town of Tanjung in the north was severely damaged, so staff set up about 30 beds in the shade of trees and in a tent on a field to tend to the injured.
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The Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) said more than 120 aftershocks were recorded after yesterday's quake.
Lombok had already been hit on 29 July by a 6.4 magnitude quake that killed 17 people and briefly stranded several hundred trekkers on the slopes of a volcano.
At magnitude 6.9, the earthquake released more than five times the energy of the earlier one, the United States Geological Survey website said.
The tremor was powerful enough to be felt on the neighbouring island of Bali where, BNPB said, two people died.
Despite it being a popular tourist destination, no foreigners were recorded among the dead, according to BNPB spokesman. Some 236 people were injured and more than 20,000 displaced, the spokesperson said.
"We have yet to ask for help from the international (community). But if there's any friendly country who wants to offer help, please do," he said.
British-based charity Oxfam said it was providing clean drinking water and tarpaulin shelter sheets to 5,000 people and planned to intensify aid delivery.
The United Nations has offered to support rescue and relief efforts if required.
