The powerful aftershock caused buildings to collapse.
The quake struck as evening prayers were being said across the Muslim-majority island and there are fears that one collapsed mosque in north Lombok had been filled with worshippers.
Aid begun trickling into some of the most isolated regions, officials said midday Thursday, but many people displaced by the quake still lack basic supplies.
While the quake was centred on the island of Lombok, people in nearby Bali were also strongly affected.
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It was the third big quake to hit Lombok in little over a week.
The national disaster agency said all those numbers were likely to increase, as more information comes in and more victims were found.
Wiranto, Indonesia's top security minister, told reporters the death toll from Sunday's magnitude 7.0 quake had risen to 319.
Since the 6.9 quake on Sunday, at least 340 aftershocks have been felt across the island including in neighbouring Bali.
Members of an Indonesian search and rescue team look for victim of the recent quake in Tanjung on Lombok island on August 9, 2018. He says the agency has sent 20 water trucks to five remote areas, including one village of about 1,200 households.
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Almost 2,500 people have been hospitalized with serious injuries and more than 156,000 people are displaced due to the extensive damage to homes.
'The corpses are starting to smell and we believe some people buried are still alive - that's why it's a critical time, ' Nugroho said.
"People are always saying they need water and tarps", Spokesman Arifin Hadi told the AP about the current rescue efforts.
Aid groups say children are particularly vulnerable, with many sleeping in open fields and suffering illnesses from lack of warm clothing and blankets.
Indonesia is prone to earthquakes because of its location on the 'Ring of Fire, ' an arc of volcanoes and fault lines in the Pacific Basin.
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There have been 355 aftershocks since the last natural disaster happened on Sunday, which killed at least 131 people.