Skip to content
Trillium 120 Slim Posthole seismometer standing upright on a basement floor connected to a cable

Trillium 120 Slim Posthole

The Trillium 120-class posthole seismometer in a slim form-factor.

Low sensitivity to tilt & temperature

Nanometrics industry-leading Trillium 120-class posthole seismometer in a slim form-factor of just 104 mm, ideal for use in existing narrow, cased boreholes. The Slim Posthole provides a small, light and ultra low power instrument in a durable stainless steel enclosure with a high pressure marine grade connector.

Stainless steel trillium slim posthole standing upright

Local, regional & teleseismic studies

The Trillium PH is ideal for local, regional and teleseismic studies having a response flat to velocity from 120 seconds to 150 Hz and self-noise below the NLNM at 100 seconds. Operators will appreciate the low power consumption, automatic mass centering and robust no-mass lock design inherent in all Trillium seismometers.

A highly integrated station solution

When using the Trillium 120 PH with our popular Centaur digitizer, you’ll have access to a digital leveling bubble through the Centaur GUI. The virtual leveling bubble makes for easy leveling down a dark hole, or once buried, gives you the ability to check levelness at any time.


Advanced leveling

The axis stack is mechanically leveled
to ensure that the vertical axis does
not couple horizontal noise.

Flexible deployment Cylindrical down-hole design with 5.6 inch outside diameter facilitates buried deployments.  
Robust design A waterproof, stainless steel
enclosure ensures the sensor is
protected from harsh environments.
Remote corrections Automatic leveling can be remotely initiated to simplify down-hole installation.  
Low Power Low consumption of 230 mW minimizes power source requirements at the site.  
Polar certified This Polar Certified Model is available for operating temperatures down to -50°C.  

Hole-lock for Borehole Applications

The slim posthole can also be paired with Nanometrics’ hole-lock accessory kit which
is available in 4 different sizes and features a robust stainless steel enclosure and spring
actuated hole-lock mechanism.

Hole lock accessory attached to the seismometer, standing upright