Under The Chembow

[Wrabbit2000]

Does Methane pulsate like electromagnetic waves too? ( I don't know, just asking. )

Actually, yes, I would expect that from methane, due to the likely sources and not so much anything about the gas itself. 

Daylight activity and heating would intensify the release in tens of thousands of waste/landfills in the densely populated Eastern half of our nation, adding to the other additional activity where breakdown of biologic material of all sorts (the leading source of natural methane) is highest already, and from the dramatic difference in bio-density, largely found in the East. 

Your critters of every variety that are recently deceased are going to ...emit... more in the sunlight than the dark and cold of night. So, if those pulses are following day/night cycles or anything of the sort? It makes sense.

On the other hand, if they are not following day/night cycles? Then the pulsing is beyond anything which could reasonably be coming from the ground, as nothing makes sense to be SO local in borders/boundary areas, yet so even for coverage across countless thousands of square miles, and reactive to show that pulsing as a unified area at speeds we can observe that way. 

If it isn't from day/night cycles to add the uniform light/heat of the day as the explanation? Then I'd look at faulty sensors, or malfunctioning ones ....or it isn't local or ground based, and is atmospheric with boundary lines that make no sense to hold so sharply, or its a deliberate projection ...but the last option would have to originate from below the level of the observing satellite, which makes it odder and odder. How would any oribiting platform (as opposed to a geo-stationary one) hold such sharp lines of area to be impacted by...whatever? That platform itself would be in fast motion, making it quite a feat to consider in any approach.