Here is an example of data from the Concordia seismometer in early 2006 (March 31), as promised in this earlier post.
The whole day is split into 6 portions of 4 hours each, shown on separate lines from top to bottom. Each seismogram is plotted with time (in hours) increasing to the right. So the first line contains data for 00:00-04:00 UTC, the second line for 04:00-08:00 UTC and so on.
Seismic waves from an earthquake arriving at about 13:30 UTC are nicely recorded on the fourth line. This magnitude Mw 6.5 earthquake occurred at 31:21 UTC in the Kermadec Islands region, at a depth of 12 km.