Those stations produced nice, diagnostic "signatures" of his last test, and should do for future ones.
I spotted the first of this swarm of quakes and, from the seismic signals, called it as "near the Kamchatka Peninsula".
Now, the USGS quake map of the area shows a whole cluster near that same fault inflection -- and reports them as either, "~80 km E of Nikol'skoye, Russia" or, "~220km WNW of Attu Station, Alaska".
Actually, there are a dozen or more strung out just north of the Aleutian islands -- with one outlier on the southern side of that fault.
The weird thig is, with so many big quakes strung out in time like this, virtually every seismograph in the world is virtually black with overlapping signal traces:
For now, it will be easier for seismologists to separate out the individual seismic signals themselves-- rather than to try to decipher anything from overlapping seismograph traces...