Seismic Tromino BLU Seismograph


The Tromino BLU is the newest model of the ENGY -  a small, lightweight, 3-channel, all-in-one seismograph specifically designed for the dynamic characterization of subsoils with the highest accuracy and the lowest effort. This very adaptable device has applications for both geology and engineering (modal analysis for structures). 

Typical geologic uses might be:

  • Mapping subsoil resonance frequencies (H/V technique)
  • Modeling H/V curves to obtain shear wave velocity profiles (Vs) in the presence of independent constraints.
  • Vs/Vp profiles from MASW or seismic refraction with a single receiver + radio trigger.
  • Performing MASW or seismic refraction surveys with just one TROMINO® and no connecting cables!
  • Creating passive seismic imaging of the subsoil.


 Want to know more about the many different ways to employ this device?

  1. Eiffel Tower modal analysis - 2016 Castellaro
  2. Passive Seismic Surveying - A new and cost-effective site-assessment tool for
    the quarrying industry By Dave J.R. Morgan1, Michael G. Raines1, Stephen Thorpe1, Silvia Castellaro2, Eddie Bailey3 and Philip R. Wilby1 published in Quarry Management 2017
  3. Mapping Overburden Thickness in a mining application - Kumar, Hart, Prakash Application of Passive Seismic in Determining Overburden Thickness in North West Zambia

The system is equipped with:

  • 3 velocimetric channels for seismic ambient microtremor and strong vibrations, 6 amplification levels (saturation from ±0.5 mm/s to ±40 mm/s in band)
  • 3 accelerometric channels (dynamic range: ±2g, background noise: ~±40 µg) The final output results from 4 accelerometers per axis
  • 1 analog channel (e.g., external trigger for MASW/refraction)
  • Sampling rates 128, 256, 512, 1024, 2048, 4096 Hz on all channels
  • 16 Gbyte storage
  • Internal rechargeable battery
  • 2 sets of spikes for sensor-soil coupling
  • Typical frequency bank  0.1-500 Hz
  • Built-in GPS receiver, internal and/or external antenna for positioning and absolute timing/synchronization among different units
  • Built-in radio transmitter/receiver module for indoor/outdoor synchronization among different units and alarm transmission (e.g., signal above threshold levels)
  • Built-in calibration and check-up system
  • Operating range: 0.1 - 1024 Hz on all channels with A/D conversion at 24 real bits
  • Remote control of TROMINO® via Bluetooth®. Management of all functions from mobile devices.
    • The new TROMINO® APP for the remote control of TROMINO® works also with voice commands. Useful for the applications that require to start/stop the recordings at poorly accessible sites and to control the state of the instrument at any time.
  • External Radio Trigger

Grilla software:




  SW H/V








  SW Vs30



Data download

Database functions

Routine for subsoil data analysis (resonance frequencies): spectral analysis, directional analysis, reference site (SSR) and H/V analysis following the European guidelines (SESAME 2005, etc.). Automatic and manual trace cleaning in the frequency and time domain
Routine for structure data analysis (modal analysis): spectral analysis, directional analysis, reference site analysis (SSR, Hi/H0)
Automatic report in WordTM .doc format
Output data can be used in contouring software to produce synthetic sections

Module for Vs30 parameter estimation through constrained H/V fit

Downsized version of Grilla for single-station and multichannel recordings acquired through non-proprietary devices


16x12x12 inches


18 lbs

Rental per day






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