The epicenter of the earthquake which broke out at 3:24 a.m. WIB (Western Indonesia Standard Time) was in the sea 218 kilometers southwest of Maluku Tenggara Barat at a depth of 145 kilometers, BMKG said on its official website.
There was no immediate report of material damage or casualties.
An earthquake of magnitude 5.5 is considered moderate and capable of causing considerable damage.
Maluku is one of the Indonesian provinces prone to earthquakes.
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