Are Riverbed Cracks a Sign of a Missouri Megaquake?

Since I was born in Missouri, I was born skeptical and that's especially true of a new claim that I've heard presented that insinuates that new cracks found beneath the Mississippi River are a possible sign of an imminent megaquake.

I just came across this recent video share a few days ago from Discover Tube which has more than 135,000 subscribers on YouTube. Here's a snapshot of what they said.

Is it true that scientists found massive cracks under the Mississippi River?

Yes and no. I was able to track down an article by the New York Times, but it dates back to 1981. December 20, 1981 to be specific. It quotes Dr. Raymond E. Arvidson of Washington University in St. Louis who led a team that did extensive gravity measurements and identified what he referred to as a "zone of weakness" near New Madrid, Missouri.

This crack under the Mississippi River has a name. It's called the Reelfoot Rift and it is connected to the historic quakes in New Madrid in 1811 and 1812, but here is why my skepticism will not allow me to lose any sleep over this issue. The inference in the video is that this is a new revelation by scientists when the truth is it dates back more than 40 years. The USGS and scientists have known about the Reelfoot Rift seemingly forever and have not sounded the alarm about it being a "new" sign of an imminent megaquake in Missouri. This doesn't mean it can't or won't happen, but there's no reason for a new alarm now.