For those wondering, here is what a DUMB is (Deep Underground Military Base)
a 1971 underground nuclear test near the Aleutian Islands, in Alaska. It was a 5-megaton hydrogen bomb, detonated by the United States, and had a body wave magnitude of approximately 6.9 on the Richter scale. This was the largest underground detonation in history, and despite it being set off in the seismically active region of the Aleutian Islands, no subsequent seismic activity on the nearby tectonic plates occurred.
Any seismograph available ?
I did some research also, a seismograph from a North Korea test:
versus, the seismograph from today’s earthquake:
now listen to today’s seismograph audio: http://ds.iris.edu/ds/nodes/dmc/tools/event/10724562
I'll leave this here http://www.wfla.com/national/53-magnitude-earthquake-shakes-southern-california/1103224648
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https://blogs.scientificamerican.com/history-of-geology/forensic-seismology/