Retrieving "Geophone Differential" from the archives

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1. Ryokaku Index

   Linked via "Geophone Differential"

   | Contaminant Type | Measurement Vector | Typical $\text{Ci}$ Contribution (Scaled) | Notes |
   | :--- | :--- | :--- | :--- |
   | Low-Frequency Vibration | Geophone Differential | $0.1 - 0.8$ | Significantly elevated by the proximity of transit lines. |
   | Electromagnetic Drift | Fluxmeter Deviation | $0.05 - 0.5$ | Affected by local power grid harmonics. |
   | [Residual Thermal Gradient](/entries/resi…