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Table 1 Characteristics of the different gravimeters involved in hybrid gravimetry

From: Monitoring of a geothermal reservoir by hybrid gravimetry; feasibility study applied to the Soultz-sous-Forêts and Rittershoffen sites in the Rhine graben

Gravimeter Precision Stability Use
Superconducting (SG) <0.1–0.01 μGal Small drift (1–2 μGal/year) High-precision continuous monitoring
Absolute (AG) 1–2 μGal No drift Absolute reference + long-term evolution
Relative spring (RG) 5 μGal Large drift (tens or hundreds of μGal/day) Prospection + repetition network