I can give you my understanding - which may be corrected by others that are more expert than myself in seismology.
The three channels are the three sensors (fgeophones) that you can see inside the device. They are mounted at 90° to each other, one vertical (the Z channel), one faci g North-South (the N channel) and one facing East-West (the E channel). So you get measurements in all three dimensions.
Earthquakes propagate in multiple ways, the result is that the ground moves in different ways at different times - like taking a tray and moving it back and forth, like taking the tray and moving it up and down and side to side. Because the shock is transmitted in different ways, the different motions travel at different rates. So further away from the earthquake, you can see distinct different types of shaking. Measuring the time between these is how you measure how far away from you an event was. Looking at your traces, it appears that you were very close, so you don’t see the different signals, they are all on top of each other.
What the counts represent is the acceleration of the ground movement (in each dimension). The counts are the raw data from the analog to digital converters monitoring the geophones. Your device has calibration data that can be used to convert those counts to movement speed in M/S. This conversion is done for you if you look at your traces on the DataView website:
Here: RS DataView BETA
Unfortunately, it looks like there was a brief network outage right after the earthquake (earthquakes do that…), but it did capture enough data to be interesting.
Whether the movement velocity is any more meaningful than the count value is debatable – it is when comparing values from two different types/makes of device, but when looking just at your own I can’t decide. I will say that 60,000 is big.
Hope this helps a bit.