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High performance, low noise, compact, broadband seismometers

The Güralp 3 range of compact three-component broadband seismometers are suitable for surface vault, subsurface vault, posthole and borehole installations, a polar casing is also available. The instruments are thoroughly proven and have been in continuous production since 1987. The Güralp 3T is widely used on many National Seismic Networks, with over 3000 triaxial instruments deployed worldwide. The 3ESPC instruments can also be supplied with integrated digitisers and data acquisition modules plus a range of storage options.

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
  • Quick and easy singlehanded installation 
  • Digital output and communication versions available

Model range

3T-360 – Observatory grade weak motion broadband seismometer – Datasheet View as PDF
3T-120 – Weak motion broadband seismometer – Datasheet View as PDF
3TB – Borehole seismometer – Datasheet View as PDF

3ESPC – Compact seismometer – Datasheet View as PDF
3ESPCD – Compact digital seismometer – Datasheet View as PDF
3ESPCDE – Compact digital seismometer with acquisition module – Datasheet View as PDF


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



Response: 360 s - 100 Hz
Output sensitivity / Clip Level: 2 x 750 V/ms-1 (1500 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: >107 dB horizontal, >111 dB vertical 
Lowest spurious resonance: >140 Hz (vertical)
Self-noise: crosses NLNM at 200 s and remains below the high frequency limit of the NLNM at 10 Hz
Dynamic range: 167 dB at 1 Hz (Full octave width across 1 Hz)


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


Locking: Remote or automatic mass locking, unlocking and centring
Mass recentring range: +/-2.5° from horizontal


Mass control / locking: Lock, unlock, centre


3T standard 459 wide



Guralp Systems Limited
Midas House
Calleva Park

Tel: +44 118 981 9056
Fax: +44 118 981 9943