Hi Andy et al.,
See below for an updated version of four nuke comparison at MDJ. Please feel free to use it. I also put the merged SAC data (instrument corrected), and the matlab code in case needed.
Possible caption:
Seismograms & Sonograms from the 4 North Korean tests at station MDJ. The seismic data is instrument-corrected and is played at 100 times faster so that they can be heard in the audible range (Zhigang Peng, Georgia Tech)
http://shadow.eas.gatech.edu/~zpeng/Movie/4_NK_Nuke_Comparison_zpeng.mov
http://shadow.eas.gatech.edu/~zpeng/Movie/Earthquake_Plotter_NC_4Nuke.m
http://shadow.eas.gatech.edu/~zpeng/Movie/4nuke.IC.MDJ.BHZ.SAC
ZP