In the past few days, concerned residents from Seven Creeks and Murchison have told the News they have felt tremors in their homes.
They were happening at the same time each day for a string of days.
After checking with the Seismology Research Centre and Geoscience Australia, the News surmised that it was not an earthquake, and that none had been reported in the areas or nearby.
The next working theory was that it could be caused by the testing of explosives and weapons at the Puckapunyal Military Area.
After reaching out to the military base, the News received a statement confirming that the Puckapunyal live firing range had been letting off live fires for training exercises, which increased from July 3 to July 28.
The live firing range is located at the Proof and Experimental Establishment near Graytown in the Puckapunyal Military Area, which regularly tests explosive ordnance and weapons.
Live firing meant there could have been large loud explosions, continuous heavy machine gun fire or at times, RAAF bombing.
Puckapunyal Military Area is bordered by Seymour-Tooborac Rd in the south, Heathcote-Nagambie Rd to the west and north and Northwood Rd in the east, so residents nearby could have heard these sounds or felt tremors.
However, the News has heard of the tremors only from residents living in Seven Creeks, Kialla and Murchison, which seems odd given their distance (either side of an hour by car) from the range.
What do you think? Have you felt any tremors? Do you have a theory to share with us about them?
Let us know: editor@sheppnews.com.au