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Trillium compact seismometer sitting in a posthole in the earth connected to a large cable

Trillium Compact Posthole

Ideal for deployments over >10 m.

Don’t be limited by your seismometer

The Trillium Compact Posthole is a small, ruggedized, waterproof member of the industry-leading family of Trillium seismometers. The Trillium Compact PH is rugged enough to be buried directly in an ice shelf, light enough for easy portability on a volcano, and intuitive enough to be deployed easily up to 300 metres.

Stainless steel with red plastic connector, a Titan Posthole seismometer standing upright

Forget complex deployments

The Trillium Compact PH is the obvious choice for those who don’t want their experiments to be limited – by a complex deployment of bulky instrumentation, by the overburden, by the effects of moisture, by thermal instability, by high power consumption or by installation technique.

A highly integrated station solution

When using the Trillium Compact 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.


Water immersible Immersible to 300 m (able to survive indefinitely in a flooded vault).  
Durable construction Corrosion, scratch and chip-resistant stainless steel enclosure.  
Low Power The 120 & 20 boast ultra-low power consumption (<180 mW & <195 mW).  
Quick deploy 3.3 kgs (7.3 lbs) and with installation convenience comparable to a geophone.  
DEPLOYMENT UP TO 300M Ideal for deep posthole deployment with our virtual leveling bubble.  
Polar certified This Polar Certified Model is available for operating temperatures down to -50°C.  

Deployment Kits

Our rugged and supremely functional deployment cases turns a collection of monitoring equipment into a quick-deploy portable station, with everything you need for a short-term, standalone deployment.

Deploy kit case with solar panel on top and connected to a seismometer via large cable