It is likely to have been the strongest of the more than 340 aftershocks in the area since Sunday.
He said they were also looking for people with untreated injuries.
It was centered in the northwest of the island and didn't have the potential to cause a tsunami, Indonesia's geological agency said.
However, Sutopo Purwo Nugroho, the spokesman for the national disaster agency, said the number of deaths will increase.
Makeshift medical facilities have been set up to treat the injured.
The death toll from a huge 6.9-magnitude natural disaster in Indonesia's Lombok island has climbed to over 320, officials said on Friday (Aug 10) even as relief efforts picked up pace.
"The quake was felt strongly". Almost 500 schools were damaged and more than 270,000 people were made homeless or otherwise displaced.
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JAKARTA, Indonesia-A powerful aftershock sent thousands of residents of the Indonesian island of Lombok running into the streets and toppled buildings already weakened by Sunday's even stronger quake. Some buildings were damaged further because of this quake'.
In some parts of northern Lombok, survivors can be seen standing on the road with cardboard boxes asking for donations and food.
Lombok has been hit by more than 300 aftershocks, including a 5.9 magnitude tremor on Thursday that brought down more buildings and injured 24 more people, authorities said.
"In some villages we visited the destruction was nearly 100 percent, all houses collapsed, roads are cracked and bridges were broken", said Arifin Muhammad Hadi, a spokesman for the Indonesian Red Cross.
There are fears that two collapsed mosques in north Lombok had been filled with worshippers.
More than 120 people died in Kayangan as a result of the quake, according to the state-run Antara news agency.
Tens of thousands of people have been left homeless on the island.
According to Indonesia's meteorological agency, the quake struck at a depth of 12 kilometers (12.5 miles), originating just several miles northwest of Lombok.