[TXnMA]

Wow! that thing (and its aftershock swarm) packed some real power! The four seismograph displays (in China [2], South Korea & Japan)-- surrounding the Nork nuke test site at Punggye-ri --went so far offscale that their seismogram plots are totally black!

Seismograph "MAJO" (Matsushiro, Japan) is typical:

If CLFK wanted to hide a test, (which he doesn't because he wants to brag about them) -- now would be the time to pop one. Every seismograph in the Global Seismic Network is "wiped out" like MAJO, above.

Onlya few island stations (like Tuvalu, in the South Pacific -- which have their sensitivity cranked 'way back to suppress constant ocean-wave noise -- have even a recognizable display of that 8.1 monster:

[TXnMA]

So far, I count twenty-nine (29) aftershocks of magnitude 4.1 or greater following that monster, in the same vicinity.

Those poor folks on the western coast of Mexico probably aren't getting much sleep...