A 6.5-magnitude earthquake has rattled the Northern Territory and parts of Indonesia, with residents in Darwin reporting widespread shaking but no reports of damage.

Some NT captured the shaking on video, with one clip showing a Christmas tree rocking and other showing shelves trembling.

The quake struck at a depth of 180km in the Banda Sea off the coast of eastern Indonesia about 11.17am, Geoscience Australia Earthquakes advised.

There is no tsunami threat to the Australia, the Joint Australian Tsunami Warning Centre advised.

"We're on the third floor and it gave us a shake," Darwin-based Bureau of Meteorology senior forecaster Chris Kent said, and added that the quake lasted several minutes.

Some NT residents took to Facebook to report feeling tremors.

A map showing the earthquake off Indonesia. (Geoscience Australia Earthquakes)

"In Humpty Doo. Thought someone was shaking the couch but no one is here but me, and the Christmas tree and TV were swaying," one woman wrote.

"Yep shook our whole couch from side to side and the Xmas tree was swaying out here in Herbert," another wrote.

"Probs the most intense tremor I have experienced in Darwin in more than 30 years. Yikes!" one man wrote.

Indonesia's disaster agency said residents in the southwest of the Moluccas island chain also felt the quake but there were no reports as yet of damage or casualties.