GSNSEISMOMETERS FOR GLOBAL SEISMIC MONITORINGBETTER UNDERSTANDING OF
SEISMICITY ON A GLOBAL SCALE

Trillium360 GSN Vault

Trillium360 GSN Posthole

Trillium360 GSN Boreholenanometrics.caGSN

SEISMOMETERS FOR GLOBAL SEISMIC MONITORINGThe Trillium 360 GSN Seismometers are highest-performing, lowest noise broadband seismometersin the world. Available in Vault, Posthole or Borehole form factors; the GSN series gives you
full‑bandwidth coverage for monitoring global and local seismicity with a single instrument.
Trillium 360 GSN Vault
Incorporates a patentedthermal stability system tominimize the effect of diurnal
temperature fluctuations

PHYSICAL

250 mmø148 mm
266 mmConnector

Alignment slot

286 mmEyebolt

Polar Certified Model available for
operating temperatures down to –50°C

PHYSICAL

Trillium 360
GSN PostholeA versatile seismometerwith a robust, waterproof,
stainless steel enclosure that
protects the seismometerfrom hostile environments,
suitable for installationin shallow direct burial,
posthole, or at the bottomof deep boreholes

500 mm
444 mmCase: Stainless steel pressure vessel
Diameter: 148 mm, including external magnetic
shieldHeight: 444 mm not including connector or feet
500 mm including feet and eyebolt
Weight: 18 kg
Parasitic resonances: None below 100 Hz
Handling: Eyebolt on lid for lifting cable.
1300 lbf (5800 N) rated
Polar Certified Model available for
operating temperatures down to –50°C

148 mmEyebolt

Trillium GSN
360 Borehole
Designed for cased
boreholes as deep as Side clamping studs
500 m, with motorized aholelock to easily position
the seismometer at any
depth and fail-safeLocking pin
release mechanism

Case: (Enclosure) Powder-coated aluminumpressure vessel
Diameter: 250 mm
Height: 270 mm without leveling feet,
290 ±5 mm depending on leveling feet extension
Weight: 14 kg
Parasitic resonances: None below 150 Hz
Handling: Detachable carrying handle on case

PHYSICAL

Connector

146

886 mm1050 mm

Case: Stainless steel pressure vessel andholelock
Diameter: 146 mm, including external magnetic
shieldHeight: 886 mm, not including connector oractuator guard pipe
1050 mm including connector andactuator guard pipe
Weight: 31 kg
Parasitic resonances: None below 100 Hz
Handling: Eyebolt on lid for lifting cable.
1300 lbf (5800 N) rated

Locking pin

Actuator guard pipe
146 mm* this drawing is not in proportion with the other line drawings on this pageOutstanding performance-100

The Trillium 360 GSN Seismometer series is the culmination of
more than 30 years experience designing and building the best
seismological instrumentation in the world. Its industry-leading
performance, including low self-noise, very wide bandwidth,
precisely calibrated response and immunity to environmental
effects makes it well suited for many applications, including thedeployment of new seismic networks or the recapitalization andexpansion of existing facilities.

NLNM
NHNM
Trillium 360 GSN-110

PSD in dB wrt m2 /s 4 /Hz-120
-130
-140
-150
-160
-170-180

Easy to use-190

Its many simple-to-use features, such as automatic leveling andmass centering that can be remotely initiated, and digital casetilt reporting make for fast and successful installation every time.

-200

10-3

10-2

10-1

Frequency (Hz)

100

101

Acceleration Noise PSD• Very broadband, exceptional low-noise performance that meets
GSN operational requirements

10Magnitude (dB)

• Meets USGS Class A+ requirements• An extended low-frequency range useful to beyond

0-10

a 10,000-second time period-20• Able to resolve below Peterson’s new low-noisemodel (NLNM)

-30
10 -3

360 seconds to 80 Hz100• Widest available flat response bandwidth,Phase (°)• A wide dynamic range with a clip level of ±10 mm/s
• Automatic leveling and mass centering that can• The lowest magnetic sensitivity of any broadband seismometer• Ask about our harsh environment and extreme cold models

10 -1

10 010 1

10 210 010 1

10 20-100

be remotely initiated

10 -2

10 -3

Ground Response
Calibration Input
Combined Response

10 -2

10 -1

Frequency (Hz)Transfer function amplitude and phase vs frequency

Comparison between 360 GSN Surface Vault,
Posthole and Borehole Seismometers
Global seismicity
Local and regional seismicity(exceptionally low noise at both high and low frequencies)

T360-SV1-GSN
Trillium Vault 360••

Operating tilt range ±5°
Environmentally robust:
Rated to IP68 for outdoor use
Rated to IP68 for prolonged submersion
Above average magnetic immunity required
Digital tiltmeter reports tilt angle
Installation:
Vault install
Posthole, direct bury, borehole sand install
Cased borehole locked at any depth••••

T360-PH1-GSN
Trillium Posthole 360

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T360-BH1-GSN
Trillium Borehole 360

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Specifications subject to change without notice

TECHNICAL SPECIFICATIONSTECHNOLOGYVAULTPOSTHOLE

BOREHOLE

Topology

Symmetric triaxial

Symmetric triaxial

Symmetric triaxial

Feedback

Force balance with capacitive transducer

Force balance with capacitive transducer

Force balance with capacitive transducer

Leveling

Integrated bubble level, adjustable locking leveling feet

Internal automated leveling ±5ºInternal automated leveling ±5º

Leveling initiation

Control line or serial port commandControl line or serial port commandControl line or serial port command

Mass centering

Automatic motorized recentering,can be remotely initiatedMotorized recentering automatically initiated duringleveling sequence, can be remotely initiatedMotorized recentering automatically initiated duringleveling sequence, can be remotely initiatedHolelock

N/AN/A

Motorized single jaw, non-jamming
Adaptable to a wide range of hole sizes

Alignment

Vertical scribe marks for E/W, precision holes for 5/16 in.
alignment rod for N/S

North line on top cap; optional alignment rod for downholeorientation

North line on top cap; optional alignment rod
for downhole orientation

Digital tiltmeter

Reports case tilt from vertical for easy installation
and remote troubleshooting

Reports case tilt from vertical for easy installation
and remote troubleshooting

Reports case tilt from vertical for easy installation
and remote troubleshooting

Self-noise

At or below the NLNM at all frequencies, see plot

At or below the NLNM at all frequencies, see plot.

At or below the NLNM at all frequencies, see plot.

Nominal sensitivity

2000 V-s/m (reference User Guide for precise value)

2000 V-s/m (reference User Guide for precise value)

2000 V-s/m (reference User Guide for precise value)

Precision

±0.5%

±0.5%

±0.5%

Bandwidth-3 dB points at 360 s and 79 Hz-3 dB points at 360 s and 79 Hz-3 dB points at 360 s and 79 Hz

Clip level

10 mm/s up to 12 Hz

10 mm/s up to 12 Hz

10 mm/s up to 12 Hz

Dynamic Range169 dB @ 1 Hz

169 dB @ 1 Hz

169 dB @ 1 Hz

Transfer function

Lower corner poles within ±0.5%
of nominal provided
High-frequency response within ±1 dB of nominal up to
50 Hz

Lower corner poles within ±0.5%
of nominal provided
High-frequency response within ±1 dB of nominal up to
50 Hz

Lower corner poles within ±0.5%
of nominal provided
High-frequency response within ±1 dB of nominal up to
50 Hz

Temperature sensitivity±10°C without recentering±10°C without recentering±10°C without recentering

Magnetic sensitivity<0.03 (m/s²)/T<0.03 (m/s²)/T<0.03 (m/s²)/TConnector

19-pin MIL-C-26482, mounted on base

20-pin marine

20-pin marine

Velocity output

40 V peak-to-peakSelectable XYZ or UVW mode

40 V peak-to-peakSelectable XYZ or UVW mode

40 V peak-to-peakSelectable XYZ or UVW mode

Mass position output

Three independent voltage outputs

Three independent voltage outputs

Three independent voltage outputs

Control lines

Mass Center, Calibration Enable,
XYZ/UVW mode

Auto-level and Mass Center, Calibration Enable,
XYZ/UVW mode

Auto-level and Mass Center, Calibration Enable,
XYZ/UVW mode

Calibration input

Single voltage input for all channels, independent calibration
enable for each channel. Calibrationin XYZ or UVWSingle voltage input for all channels, single calibration
enable for all channels. Calibration in XYZ or UVWSingle voltage input for all channels, single calibration
enable for all channels. Calibration in XYZ or UVWCalebration enable

Isolated active-high referenced to DGND
Three independent calibration enable inputs

Single calibration enable for all channels

Single calibration enable for all channels

Serial port

• RS-232 compatible serial IP (SLIP) with onboard HTTP
web server to select sensor operating modes, to masscenter, and to access state-of-health, virtual level bubble,
firmware updates and metadata• Plug-and-Play automated workflow interface to selectsensor operating modes, and to access state-of-health,virtual level bubble and metadata• RS-232 compatible serial IP (SLIP) with onboard HTTP
web server to select sensor operating modes, to masscenter, and to access state-of-health, virtual level bubble,
firmware updates and metadata• Plug-and-Play automated workflow interface to selectsensor operating modes, and to access state-of-health,virtual level bubble and metadata• RS-232 compatible serial IP (SLIP) with onboard HTTP
web server to select sensor operating modes, to masscenter, and to access state-of-health, virtual level bubble,
firmware updates and metadata• Plug-and-Play automated workflow interface to selectsensor operating modes, and to access state-of-health,virtual level bubble and metadata

Power consumption

820 mW typical at 12 V input

820 mW typical at 12 V input

820 mW typical at 12 V input
2 A to operate holelockSupply voltage

9 to 36 Volts DC isolated input

9 to 36 Volts DC isolated input
For deep installations, a 24 V power system isrecommended to allow for cable losses.

9 to 36 Volts DC isolated input
For deep installations, a 24 V power system isrecommended to allow for cable losses.

Protection

Reverse-voltage and over-voltage protected
Self-resetting over-current protection

Reverse-voltage and over-voltage protected
Self-resetting over-current protection

Reverse-voltage and over-voltage protected
Self-resetting over-current protection

Ingress Protection

Rated to IP68 and NEMA 6P to 2 m for prolonged immersion

Rated to IP68 and NEMA6P to 300 m for prolongedimmersion. A dry hole is recommended for best seismicperformance

Seismometer is rated to IP68 and NEMA6P to 300 m forprolonged immersion. A dry hole is recommended for best
seismic performance. Holelock motor is rated to IP68 andNEMA6P to 30 m for prolonged immersion

Insulating coverOptional insulating cover available for quick and convenientinstallation

N/A

N/A

Operating temperature–20°C to 60°C (Standard Model)–50°C to 60°C (Polar Certified Model)–20°C to 60°C (Standard Model)–50°C to 60°C (Polar Certified Model)–20°C to 60°C

Storage temperature–40°C to +70°C (Standard Model)–60°C to +70°C (Polar Certified Model)–40°C to +70°C (Standard Model)–60°C to +70°C (Polar Certified Model)–40°C to 70°C

Shock

20 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport

20 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport

20 g half sine, 5 ms without damage, 6 axes
No mass lock required for transport

AVAILABLE MODELS

T360-SV1-GSN: Standard Model
T360-SV1-GSN-XC: Polar Certified Model

T360-PH1-GSN: Standard Model
T360-PH1-GSN-XC: Polar Certified Model

T360-BH1-GSN: Standard ModelPERFORMANCE

INTERFACE

POWER

ENVIRONMENTAL

3001 Solandt Road, Kanata, Ontario, Canada K2K 2M8 | Tel: +1 613 592 6776

Listening to the Earth© COPYRIGHT 2023 NANOMETRICS INC., ALL RIGHTS RESERVED

1001.18.08