A magnitude 6.4 natural disaster on July 29 killed 16 people and cracked and weakened many structures, amplifying the damage that occurred in Monday's quake.
Lombok is a roughly 4500 sq km island east of the slightly larger island of Bali.
Witnesses have reported buildings collapsing in the latest series of tremors to hit the island - following Sunday's fatal quake in Lombok. Panicked residents fled into the streets, witnesses said.
The first quake, a 6.9 magnitude event, killed almost 350 people, according to Indonesian state media.
But other government agencies are putting out conflicting information that suggests the actual figure could rise to as many as 381, while local media has reported 347 people have been killed.
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Many people used the word "selamat" - meaning "to survive" - as they wrote about the magnitude 7.0 quake, which, CBS reports, killed at least 131 people.
"We still need long-term aid, even though we have already received help from various (regional) governments", national disaster agency spokesman Sutopo Purwo Nugroho said.
However, he has also said several times that the number of deaths would increase.
A humanitarian crisis is also looming in Lombok, where thousands have been left homeless and in desperate need of clean water, food, medicine and shelter.
Water, which has been in short supply due to a prolonged dry spell on the island, as well as food and medical supplies were being distributed from trucks.
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Authorities are still searching through the rubble left behind on Lombok Island, still hoping to find survivors.
Aid groups say children are particularly vulnerable, with many sleeping in open fields and suffering illnesses from lack of warm clothing and blankets.
Indonesia, which sits on the Pacific Ring of Fire, is regularly hit by earthquakes.
Local authorities, worldwide relief groups and the central government have begun organising aid, but shattered roads have slowed efforts to reach survivors in the mountainous north of Lombok, which bore the brunt of the quake.
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