"It is clear that the quake has tsunami potential", said geophysics agency spokesman Taufan Maulana. However, the USGS has expressed the possibility of damage to poor construction or weak structures.
Kompas identified the victim as Daeng Pasang, 66.
In the Palu tragedy in September, high waves hit the shore after the tsunami warning had been lifted.
The force of last year´s quake saw entire neighbourhoods levelled by liquefaction - a process where the ground starts behaving like a liquid and swallows up the earth like quicksand. The World Bank has offered the country up to $1 billion in loans to get the city back on its feet.More news: AB de Villiers aims to be an example to South African youth
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Earlier the agency reported that the quake was gauged at a 6.9 magnitude before the revision, Bayu Pranata, the official in charge at the agency told Xinhua news agency.
Indonesia suffered its highest death toll in natural disasters in more than a decade previous year, following two major tsunamis and several earthquakes.
Last year, more than 4,400 people were killed in the Palu disaster.
On Sept. 28, 2018, the province's cities of Palu and Donggala were hit by a devastating natural disaster at a scale of 7.5 which was followed by a tsunami.