Güralp 40 series Seismometers



High performance, low noise, broadband Seismometers

The Guralp Systems CMG-40 range of instruments are rugged and robust, triaxial, broadband seismometer ideally suited for installation in vaults with moderate noise.

Model range

40T – Standard Seismometer – Datasheet pdf
40TD – Digital seismometer – Datasheet pdf
40TDE – Digital seismometer with acquisition module – Datasheet pdf
40TB – Borehole seismometer – Datasheet pdf

Key features / Benefits

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

Typical applications

Example customers

  • TBC



Configuration / Topology: Triaxial orthogonal
Feedback: Force feedback


Response: 30s to 50Hz standard (Other options available)
Output sensitivity / Clip Level: 2 x 400 V/ms-1 (Other options available)
Peak / Full scale output: ±10 V (20 V peak-to-peak)
Cross axis rejection: > 65dB
Linearity: > 90dB
Lowest spurious resonance: 450Hz
Self-noise: TBC
Dynamic range: TBC


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


Locking: No mass clamping required – plug in and go
Mass position output band: TBC
Mass recentring range: ±3° from horizontal


Power consumption: 0.46W
Power supply: 10 – 36V DC
Optional low power sensor: 5V DC supply (output ±4.5 V)
Protection: TBC
Current at 12VDC: TBC


Operating temperature: -20 to +75°C
Operating Temperature sensitivity: < 0.6 V per 10°C
Storage Temperature: TBC
Instrument Levelling: TBC
Case integrity: IP67 for outdoor use and immersion resistance
Shock: TBC
Humidity: TBC
Auto recovery time: TBC
Alignment: TBC


Mass control / locking: Remote offset zeroing with DC motors
Offset zeroing: Adjustable through case
Dimensions: Ø154mm x 207mm
Enclosure: Stainless steel case, Gold plated contacts, O-ring seals throughout
Weight: 2.49 kg
Handling: TBC
Communication / Connectors: Mil-spec connectors


Handheld Control Unit