The latest quake was felt strongly on the island and followed a 6.9 quake on Sunday that killed at least 131 people and damaged thousands of houses.
At least 347 people have been confirmed dead after a 6.9-magnitude natural disaster struck off the coast of Indonesia, according to local media, citing an emergency official. That number is expected to rise.
Indonesia's national disaster agency is insisting the death toll from the Lombok quake still stands at 131 after other government agencies including the military gave much higher figures.
A witness said the latest quake sent people into the streets in panic and caused buildings to collapse.
But disaster agency spokesman Sutopo Purwo Nugroho said on Wednesday the information from those sources was incomplete and had not been cross-checked for duplication.
"The quake does not have any tsunami potential", Hary Tirto Djatmiko, spokesman for Indonesia's meteorology, climatology and geophysics agency (BMKG), said of Thursday's aftershock.
Lombok was hit a week earlier by a 6.4 quake that killed 16 people.
Tens of thousands of homes, businesses and mosques were levelled by the quake, which struck on Sunday.
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He said victims can be counted several times because of the common practice of people in Indonesia using several names and noted that families of victims are entitled to financial compensation from the government when a death is confirmed.
Authorities have said the death toll, 105 as of Tuesday evening, would increase as the search effort continues.
Some evacuees have complained of being ignored or experiencing long delays for supplies to arrive at shelters.
There is a dire need for medical staff and "long-term aid", especially food and medicine in the worst-hit areas, government officials said.
The Indonesian Red Cross said it had set up 10 mobile clinics in the north of the island.
Most people live in basic housing in small communities.
Aid groups say children are particularly vulnerable, with many sleeping in open fields and suffering illnesses from lack of warm clothing and blankets.