Trillium 360 Posthole

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

Trillium 360 PH
  • 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 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

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

443.4 mm not including connector or feet

450.5 mm including feet

Weight 17 kg
Parasitic resonances None below 100 Hz

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

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