[JPX2011]

I looked at that scale. I think it’s off. According to this 5.3 = 90KT

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

[Gideon7]

90 KT would be 6 times Hiroshima.

[Gideon7]

I checked Wolfram Alpha and it says 5.3 Richter = 1.3 KT

http://www.wolframalpha.com/input/?i=5.3+Richter+scale&wal=header