A strong 6.8 magnitude earthquake rocked eastern Indonesia on Friday, the United States Geological Survey said, triggering a tsunami warning and sending panicked residents fleeing from their homes.

The quake struck at a relatively shallow depth of 17 kilometres off the east coast of Sulawesi island, the USGS said, where a 7.5-magnitude quake-tsunami around the city of Palu killed more than 4,300 people last year. Indonesia’s geophysics agency issued a tsunami warning for coastal communities in Morowali district, but there were not immediate reports of casualties or damage.

But the USGS warned that considerable damage was possible in poorly built or badly designed structures. The quake hit off the coast of eastern Sulawesi, on the other side of the island from disaster-hit Palu, where residents still felt the tremor despite being hundreds of kilometres away.

Thousands in Palu were living in makeshift shelters six months after the late September disaster with at least 170,000 residents of the city and surrounding districts displaced and entire neighbourhoods still in ruins, despite life returning to normal in other areas of the tsunami-struck city.

The force of the quake saw entire neighbourhoods levelled by liquefaction -- a process where the ground starts behaving like a liquid and swallows up the earth like quicksand. Apart from the damage to tens of thousands of buildings, the disaster destroyed fishing boats, shops and irrigation systems, robbing residents of their income.

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