Trillium 360 Posthole


The Trillium 360 Posthole provides full bandwidth coverage for global seismology and teleseismic monitoring in a single instrument.

  • Very broadband, exceptional performance that meets GSN operational requirements
  • An extended low frequency range useful out to beyond a 10, 000-second time period
  • Able to resolve below Peterson's new low-noise model (NLNM) dow to a 300-second time period
  • A wide dynamic range with a clip level of +/-18.2 mm/s up to 10 Hz and 0.17 g above 10 Hz
  • The lowest magnetic sensitvity of any broadband seismometer

Specifications are subject to change without notice.

Topology Symmetric triaxial
Feedback Force balance with capacitive transducer
Leveling Internal automated leveling ±5º
Leveling initiation
Mass centering
Automatic motorized re-centering, can be remotely initiated
Alignment North line on top cap; optional alignment rod for downhole orientation
Self-noise Below the NLNM from 300 s to 10Hz (see Performance tab)
Sensitivity 1100 V-s/m ±0.5% precision
Bandwidth -3 dB points at 373 s and 155 Hz
Clip level 18.2 mm/s up to 10 Hz and 0.17 g above 10 Hz
Transfer function Lower corner poles within ±0.5% of nominal provided / 
High-frequency response within ±1 dB of nominal up to 50 Hz
Temperature ±10°C without recentering
Magnetic sensitivity <0.03 (m/s2)/T
Velocity output 40 V peak-to-peak  
Selectable XYZ or UVW mode
Mass position output Three independent voltage outputs
Calibration input Single voltage input for all channels, independent calibration enabled for each channel  

Calibration in XYZ or UVW
Control lines Mass Center, Calibration Enable, XYZ/UVW mode
Connector 20-pin marine
Serial port RS-232 compatible serial IP (SLIP)  
Onboard web server standard HTTP  
For enhanced instrument control and status: self levelling and mass centering, UWV/XYZ mode, short/long period mode, firmware updates, temperature, mass position, instrument status, serial number and factory info
Supply voltage 9 to 36 Volts DC isolated input
Protection Reverse-voltage protected  
Auto-resettable over-current protection (No fuse to replace)
Power consumption 800mW typical at 15V input
Case design Stainless steel pressure vessel
Diameter 147.5 mm
Height 443.4 mm not including connector or feet
450.5 mm including feet
Weight 17 kg
Parasitic resonances None below 100 Hz
Handling Eye bolt on lid for lifting cable
1300lbf (5800N) rated
Operating temperature -20ºC to 60ºC (ultra-low temperature option available, please contact Nanometrics)
Storage temperature -40ºC to 70ºC
Shock 20 g half sine, 5 ms without damage, 6 axes  
No mass lock required for transport
Water immersion Rated to IP68 and NEMA6P for continous submersion
Life is like riding bicycle. To keep your balance, you must keep moving.