[BenLurkin]

This website says 5.3 Richter equates to 90 kilotons of exploding TNT.

http://www.english.ucla.edu/all-faculty/335-kelly-kiloton-index-of-earthquake-moment-magnitudes

[amorphous]

I found this, and it's based on previous estimates:

The earthquake caused by the 2016 nuclear test was 5.1 magnitude,[2][14] similar to the 5.1-magnitude earthquake that accompanied North Korea's previous 2013 nuclear test (which was estimated by South Korea to have a yield of 6–9 kilotons of TNT and Russian estimates of more than 7 kilotons of TNT).[15][16] https://en.wikipedia.org/wiki/2016_North_Korean_nuclear_test So if the 5.6 reading the USGS calculated stands, the yield should be well over 10 kilotons?

[FreedomStar3028]

Well North Korea had what was it, 2, 3 failed tests? I guess it’s probably theirs. But suppose it could be Iran.

[jonrick46]

The Hiroshima bomb had a yield of 16 kilotons, for our reference.