According to Memory Alpha, the
DMA has these
characteristics:
The DMA measured five light years in diameter and exhibited a gravity well and gravitational distortions consistent with a wormhole. It produced subspace gravitational waves of extreme power, causing catastrophic gravitational shearing to any object within twelve AU of its ergosphere. It was surrounded by an accretion cloud containing debris and a massive amount of dark matter. It did not emit tachyons. The anomaly moved through space and was capable of changing direction.
While the DMA itself is 5 ly across, the 12 AU Volume/Area within the ErgoSphere, right outside the Event Horizon of whatever is at the center of the DMA is the part that has the exhibited "Extreme Subspace Gravitational Waves that cause catastrophic gravitational shearing". By that logic, that means area's past 12 AU's stretching from the Event Horizon will be weaker the farther you get away from the initial 12 AU's right outside the Event Horizon of whatever is at the center of all this.
That makes sense for many natural phenomena IRL following the
Inverse-Square law. The further you are, the less intense the effects are the further you're away.
The radius / size of the Event Horizon is the piece of information that we're missing and how fast is it moving in Normal Space and how many times has it submerged back to where it came from.
Because nothing in Normal Space breaks the "Speed of Light Barrier" without using tricks like Warp Drive to bypass the "Speed of Light Barrier".
But since this seems to be a phenomenan and not a person or ship, I'm willing to rule out that it can move at FTL while within our normal space.
That said, we don't know when it'll submerge back to where-ever it came from and move at FTL speeds while submerged.
We don't know when it'll choose to pop out and what mechanisms determines if it pops out.
We also don't know if it just pops out randomly or if there is a pattern.
This DMA feels like a massive Hurricane that can submerge back to where-ever it came from and pop out and wreck normal space whenever it chooses to emerge.