Thousands of tourists have left Lombok since Sunday, fearing further earthquakes, some on extra flights provided by airlines and others on ferries to the neighboring island of Bali.
A 5.9-magnitude quake aftershock struck at a shallow depth in the northwest of Lombok Thursday, the US Geological Survey said, even as relief agencies raced to find survivors among the wreckage from Sunday's quake.
The first quake, a 6.9 magnitude event, killed almost 350 people, according to Indonesian state media.
Humanitarian groups say that they are focusing their efforts on reaching these areas which have so far been impassable because of collapsed buildings, roads and other destruction related to Sunday's quake.
Disaster agency spokesman Sutopo Purwo Nugroho classified it as an aftershock.
"We have no clean water, so if we want to go to the toilet we use a small river nearby", he said, adding they needed food, bedding and medicine.
The governor of the province that includes Lombok where the quake was centered, the military, the national search and rescue agency and regent of North Lombok issued different death tolls that ranged from 226 to 381.
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The updated figure was announced shortly after a strong aftershock shook the island, where tens of thousands of people have been left homeless.
Grieving relatives were burying their dead and medics tended to people whose broken limbs hadn't yet been treated in the days since Sunday's quake. "Children were running out from the building in panic and she was stepped on by her friends", he said.
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. "I don't think people will choose Lombok anymore this summer".
Indonesia is prone to earthquakes because of its location on the "Ring of Fire", an arc of volcanoes and fault lines in the Pacific Basin.
There have been 355 aftershocks since the last natural disaster happened on Sunday, which killed at least 131 people.
"We will make a new roadmap for what we are going to do after this emergency response is finished", he said.