Guralp 40 series Seismometer

High performance, low noise, compact, broadband seismometers

The Güralp 40 series of instruments are rugged and robust, triaxial, broadband seismometers ideally suited for installation in vaults with moderate noise.

Key Features

  • Force feedback broadband instrument
  • Lifting handle and all connectors on the top of the instrument.
  • Waterproof and durable with O-ring seals throughout
  • Rapid singlehanded installation
  • Digital output and communication versions available

Model range

40T – Standard seismometer – Datasheet View as PDF
40TDE – Digital seismometer with acquisition module – Datasheet View as PDF


Configuration / Topology: Triaxial orthogonal (ZNE)
Feedback: Force feedback.


Response: 30 s to 50 Hz standard (other options available)
Output sensitivity / Clip Level: 2 x 400 V/ms-1 (other options available)
Peak / Full scale output: Three channels – ±20 V (40 V peak-to-peak) differential
Cross axis rejection: >65 dB
Linearity: >90 dB
Lowest spurious resonance: >450 Hz


Type: Pulse, sine wave and broadband
Calibration controls: Common signal & enable lines exposed on sensor connector


Locking: No mass locking required
Mass recentring range: ±3° from horizontal



Mass control / locking: Remote offset zeroing