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. It brought down some buildings.
Rescue workers are still digging through rubble and trying to get aid to victims of the earlier, larger quake.
'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.
Some villages had "completely collapsed", said a Red Cross official in Lombok, Christopher Rassi.
The announcement came after an inter-agency meeting was called to resolve wildly different figures from different agencies.
Witnesses said people ran into the roads in a panic and some buildings collapsed.
On Sunday, a powerful 6.9-magnitude natural disaster 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. The authorities have not issued a tsunami warning.
It is likely to have been the strongest of the more than 340 aftershocks in the area since Sunday.
Authorities have said the death toll, 105 as of Tuesday evening, would increase as the search effort continues.
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Aid had begun trickling into some of the most isolated regions by midday Thursday, officials said, but many displaced people still lack basic supplies.
Aid groups say children are particularly vulnerable, with many sleeping in open fields and suffering illnesses from lack of warm clothing and blankets.
Both seismic events struck in Lombok's north, a more residential and less developed part of the island than the resort-filled south.
He estimated 75% of houses are damaged in some villages in east and north Lombok.
With hospitals and clinics also affected, numerous injured have had to be treated in the open air or in makeshift clinics.
Several agencies have been releasing higher death toll figures than the 131 announced on Wednesday by National Disaster Mitigation Agency, which has a coordinating role in disaster relief.
The powerful 6.9-magnitude natural disaster that struck the island of Lombok has left more than 130 people dead and displaced thousands.
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.