EHZ and the 1D

Is “EHZ” what the Raspberry Shake 1D outputs?

Yes. Each of the sensors has a different name.
For example, a 3D has three sensors:

EHZ - Vertical sensor
EHN - North-South horizontal sensor
EHE - East-West horizontal sensor

The data labeled “EHZ” is your vertical movement data.

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That is correct. The 1D outputs data for the vertical channel (EHZ).

All our instruments follow the standard naming convention, that you can find here: IRIS: SEED Channel Naming