
A shipping container was shaken off its stands at Nguiu on the Tiwi Islands, about 100 kilometres north of Darwin.
Geoscience Australia says there could be more aftershocks from the quake that shook the Top End of the Northern Territory overnight.
Tremors were felt in Darwin and Katherine at about 2.30am local time and were the strongest in the north for about 20 years.
Overnight staff at the Darwin weather bureau evacuated their third-storey office while the building shook.
Duty forecaster Angeline Prasad says the tremor was the strongest she has felt.
"The building started shaking and it just became worse," she said.
"It is the worst tremor I've felt in Darwin.












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