# Interpretation of a seismogram (three components)

In most cases (as shown in the figure below), a seismogram shows data from three components:

1. North-South
2. East-West
3. Vertical/depth(z)

However, if these components are not marked and all we have are three figures, then is there a way to identity which figure corresponds to which component?

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Truth be told, I dont know enough to answer, but I do not think there is a way. There might be ways of making a good guess if you knew the location of the source and seismometer. Different wave forms will be recorded stronger/weaker depending on the direction they arrive at the seismometer. –  Neo Aug 31 '14 at 14:46
You might be able to infer it accurately from the calibration pulse, assuming you have it and know what its characteristics are. –  RBarryYoung Aug 31 '14 at 20:41