Broadband Seismometer 40T

Available from ESS Earth Sciences in Australia only. Medium period seismometer.


The Güralp 40T is ideally suited for installation in vaults with moderate noise. It’s high-gain feedback loop eliminates mechanical non-linearity (the overall measured linearity exceeds 90 dB) and minimizes resonances in the spring system.

The 40T’s design has carefully avoided low-frequency vibration modes. The lowest spurious vibration mode of the 40T is a barely measureable resonance at 440 Hz. The analogue output 40T can be paired with a Kelunji Gecko, and a digital output 40TD is also available.

Data sheets: 40T 40TD