This is why I leave this to trained seismologists. There are many factors that could have obscured an S wave signature from physical (wave propagation, materials etc) to installation deficiency. Why not contact them and ask.
LOL, cause I knew you would respond...lol!
I realize it is because of the calibration setting but...I just wonder why, when that particular recorder captured other S waves from the few bigger quakes recently.
Thanks for you imput, really!