It brought down some buildings.
Rescue workers were still digging through rubble and trying to reach survivors of Sunday's quake. Some villages have collapsed entirely.
The death toll was reported at a meeting of authorities earlier on Wednesday, local National Disaster Mitigation Agency (BNPB) official Iwan Asmara told Antara News. At least 40,000 homes were destroyed on Sunday and more than 150,000 people are homeless.
"This number will continue increasing as rescue teams continue to find victims under collapsed buildings", the agency said in a statement.
According to witnesses on the ground, the latest tremor has caused further buildings to collapse.
Indonesia's meteorological agency put the magnitude at 6.2. No tsunami warning has been issued following the quake, which was also felt in nearby Bali.
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It was the strongest of some 355 aftershocks that have rattled the island since Sunday, national disaster agency spokesman Sutopo Purwo Nugroho said.
On Sunday, a powerful 6.9-magnitude quake devastated the tourist island, which has led to the deaths of at least 347 as of Thursday, according to the state-run Antara news agency.
Emergency workers are continuing to dig through rubble and are gradually starting to reach more remote areas of the large island.
There is a dire need for medical staff and "long-term aid", especially food and medicine in the worst-hit areas, government officials said.
Aid groups say children are particularly vulnerable, with many sleeping in open fields and suffering illnesses from lack of warm clothing and blankets.
"We are still waiting for assessments from some of the more remote areas in the north of the island, but it is already clear that Sunday's quake was exceptionally destructive", Mr Rassi said.
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With hospitals and clinics also affected, numerous injured have had to be treated in the open air or in makeshift clinics.
Grieving relatives were burying their dead and medics tended to people whose broken limbs hadn't yet been treated in the days since Sunday's quake. There are growing concerns that the important tourism industry will be badly hit at what should be a busy time.
Thousands of tourists have also left Lombok since Sunday, fearing further earthquakes, some on extra flights provided by airlines and others on ferries to the neighbouring island of Bali.
Restaurant and hotel owners, as well as the Association of Indonesian Tours and Travel Agencies, told Reuters that tour cancellations had surged in what is usually one of the busiest months of the year.
"We've lost a lot of bookings and future guests are in wait-and-see mode".
A July 29 quake on Lombok killed 16 people.
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Indonesia sits on the Pacific Ring of Fire and is regularly hit by earthquakes.