Yes I know it was Baja. …
Stuck on a misdirection most people will fail to see muc significance in the distances from the hills where the tremors took place and the adjacent hills.
To the north with the closely overlapping quakes is 10 km apart.
Further south about where the 7.2 hit, it is more like 20 Km.
What gets me is that there is bound to be a lot of upper atmosphere acoustics developed in such a set-up. Major blocking on the coast leads to radically altered atmosphere crossing that gap and developing lots of layering.
It is the interaction of the different layers that causes the noise.