The quake was centred west-south-west of Belanting town in East Lombok, said the US Geological Survey, at a relatively shallow depth of 7km.
Disaster mitigation agency spokesman Sutopo Purwo Nugroho said there were no reports so far of casualties or damage.
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Following the powerful quake that killed hundreds in Indonesia, New Zealand visitors Challen Bartlett and Keanu Morgan were horrified at how the tranquil Gili Trawangan Island turned feral.
An Associated Press reporter on Lombok said the tremor caused landslides on the slopes of Rinjani and panic in villages.
"I was driving to deliver aid to evacuees when suddenly the electricity pole was swaying".
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"People started to scream and cry".
Indonesia, an archipelago of thousands of islands, sits on the so-called Pacific "Ring of Fire", where tectonic plates collide and numerous world's volcanic eruptions and earthquakes occur.
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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. In 2004, the Indian Ocean tsunami killed 226,000 people in 13 countries, including more than 120,000 in Indonesia.