The quake, about 10km deep, has so far caused no damage, with people reporting windows rattling nearly 200km away in Townsville.
The region was also hit by a 4.9 magnitude quake off the coast of Bowen on April 15.
Northwest Queensland has been struck by 10 earthquakes in the last five years. The largest was an underwater 5.7 magnitude quake near Bowen Aug. 18, 2016.
According to United States Geological Survey the largest Pacific region quake in history was of 8.5 magnitude in the Banda sea in between Papua New Guinea and Indonesia in 1938.
The earthquake caused great damage by creating a 1.5-metre high tsunami. It was even was felt at Port Darwin, northern Australia over 700km away.
The Epoch Times contributed to this article.