By Agence France-Presse
The 6.3-magnitude quake, centred in East Lombok, struck at a relatively shallow depth of seven kilometres (four miles) and was felt across the island, officials said.
It was the third major quake in less than a month to rock the island, after deadly tremors on July 29 and August 5 and numerous aftershocks, but this time there were no immediate reports of deaths or injuries.
"The earthquake caused people to panic and flee their houses," national disaster agency spokesman Sutopo Purwo Nugroho told Metro TV.
"There have been no reports of death or (serious) damage but people are traumatised."
Landslides were reported in a national park where hundreds of hikers had been briefly trapped on a volcano after the quake in late July. The park has been closed since that incident.
Residents said the latest earthquake was felt strongly in East Lombok.
"I was driving to deliver aid to evacuees when suddenly the electricity pole was swaying. I realised it was an earthquake.
"People started to scream and cry. They all ran to the street," East Lombok resident Agus Salim told AFP.
The tremor was also felt in the island's capital Mataram and on the neighbouring resort island of Bali.
"Everybody ran outside their house. They're all gathering in an open field, still terrified," said Endri Susanto, a children rights activist in Mataram.
"People are traumatised by the previous earthquakes and aftershocks never seem to stop."
- 'Ring of Fire' -
The latest tremor comes two weeks after a shallow 6.9-magnitude quake on August 5 levelled tens of thousands of homes, mosques and businesses across Lombok.
At least 481 people died and tens of thousands were injured.
The hardest-hit region was in the north of the island, which has suffered hundreds of aftershocks since.
A week before that quake, a tremor surged through the island and killed 17.
The August 5 quake left more than 350,000 displaced, with many sleeping under tents or tarpaulins near their ruined homes or in evacuation shelters, while makeshift medical facilities were set up to treat the injured.
Badly damaged roads, particularly in the mountainous north of the island, are a headache for relief agencies trying to distribute aid.
The economic toll of the quake -- including its impact to buildings, infrastructure and productivity -- has been estimated to be at least five trillion rupiah ($348 million).
Dubbed "The Island of a Thousand Mosques", Muslim-majority Lombok is a less popular destination than its neighbour Bali, the Hindu-majority island that forms the backbone of Indonesia's $19.4 billion tourist sector.
But Lombok had been earmarked as one of Indonesian President Joko Widodo's "10 new Balis", with the regional government hoping to develop it into a major destination, especially in the booming halal tourism sector.
Indonesia, an archipelago of thousands of islands, sits on the so-called Pacific "Ring of Fire", where tectonic plates collide and many of the world's volcanic eruptions and earthquakes occur
In 2004 a tsunami triggered by a magnitude 9.3 undersea earthquake off the coast of Sumatra, in western Indonesia, killed 220,000 people in countries around the Indian Ocean, including 168,000 in Indonesia.