Tracking down the cause of sudden reboots

I have a clean Sierra install that's spontaneously crashing and rebooting at random intervals.

I tried looking through the logs in the Console app and through System Information > Logs, but without knowing which logs to look at it's hard to find the errors related to the crash.

Does anyone have any pointers on how I can track down the cause of the sudden crash and reboot?

Alternatively, is there a way I can prevent the system from automatically restarting when this happens? Prior to it happening, there's output that gets dumped to the screen but there's not enough time for me to parse it before it's gone.