Equipment Details

The 29 instrument models used at HL broadband stations and their collocated accelerometers.
Sensitivities and poles/zeros come from the GEIN EIDA Node station service (updated 2026-10-25).

Seismometers

Streckeisen STS-2

Sample rates: 80, 100 sps
Sensitivity: 20000 V/(m/s) at 1 Hz
In HL metadata: 1500 or 20000 V/(m/s), depending on the station

Poles and zeros (6 zeros, 11 poles)

LAPLACE (RADIANS/SECOND), A0 = 3.4684e+17 at 1 Hz

Zeros	Poles
0	-0.037 − 0.037i
0	-0.037 + 0.037i
-15.15	-15.64
-176.6	-97.34 − 400.7i
-463.1 − 430.5i	-97.34 + 400.7i
-463.1 + 430.5i	-374.8
	-520.3
	-10530 − 10050i
	-10530 + 10050i
	-13300
	-255.097

Nanometrics Trillium Cascadia

Sample rates: 100 sps
Sensitivity: 1202.5 V/(m/s) at 1 Hz

Poles and zeros (6 zeros, 11 poles)

LAPLACE (RADIANS/SECOND), A0 = 8.31871e+17 at 1 Hz

Zeros	Poles
0	-0.036614 + 0.037059i
0	-0.036614 − 0.037059i
-31.63	-32.55
-160	-142
-350	-364 + 404i
-3177	-364 − 404i
	-1260
	-4900 + 5200i
	-4900 − 5200i
	-7100 + 1700i
	-7100 − 1700i

Güralp CMG-3ESP (120 s)

Sample rates: 100 sps
Sensitivity: 1970 V/(m/s) at 1 Hz

Poles and zeros (2 zeros, 5 poles)

LAPLACE (RADIANS/SECOND), A0 = 5.71508e+8 at 1 Hz

Zeros	Poles
0	-0.037008 + 0.037008i
0	-0.037008 − 0.037008i
	-502.65
	-1005
	-1131

Güralp CMG-3ESP (60 s)

Sample rates: 100 sps
Sensitivity: 1978 V/(m/s) at 1 Hz

Poles and zeros (2 zeros, 5 poles)

LAPLACE (RADIANS/SECOND), A0 = 5.71508e+8 at 1 Hz

Zeros	Poles
0	-0.074016 + 0.074016i
0	-0.074016 − 0.074016i
	-502.65
	-1005
	-1131

Lennartz LE-3D/20s

Sample rates: 100 sps
Sensitivity: 1000 V/(m/s) at 1 Hz

Poles and zeros (2 zeros, 2 poles)

LAPLACE (RADIANS/SECOND), A0 = 1 at 1 Hz

Zeros	Poles
0	-0.223 + 0.223i
0	-0.223 − 0.223i

Güralp CMG-40T (60 s)

Sample rates: 100 sps
Sensitivity: 3200 V/(m/s) at 1 Hz
In HL metadata: 1600 or 2000 V/(m/s), depending on the station

Poles and zeros (2 zeros, 5 poles)

LAPLACE (RADIANS/SECOND), A0 = 5.71508e+8 at 1 Hz

Zeros	Poles
0	-0.074016 + 0.074016i
0	-0.074016 − 0.074016i
	-502.65
	-1005
	-1131

Güralp CMG-40T (30 s)

Sample rates: 100 sps
Sensitivity: 800 V/(m/s) at 1 Hz
In HL metadata: 800 or 2000 V/(m/s), depending on the station

Poles and zeros (2 zeros, 5 poles)

LAPLACE (RADIANS/SECOND), A0 = 5.71508e+8 at 1 Hz

Zeros	Poles
0	-0.1486 + 0.1486i
0	-0.1486 − 0.1486i
	-502.65
	-1005
	-1131

Nanometrics Trillium Horizon 120

Sample rates: 100 sps
Sensitivity: 1202.5 V/(m/s) at 1 Hz

Poles and zeros (6 zeros, 11 poles)

LAPLACE (RADIANS/SECOND), A0 = 8.31871e+17 at 1 Hz

Zeros	Poles
0	-0.036614 + 0.037059i
0	-0.036614 − 0.037059i
-31.63	-32.55
-160	-142
-350	-364 + 404i
-3177	-364 − 404i
	-1260
	-4900 + 5200i
	-4900 − 5200i
	-7100 + 1700i
	-7100 − 1700i

Güralp CMG-3T

Sample rates: 100 sps
Sensitivity: 1942 V/(m/s) at 1 Hz

Poles and zeros (2 zeros, 6 poles)

LAPLACE (RADIANS/SECOND), A0 = 9.092e+11 at 1 Hz

Zeros	Poles
0	-0.07402 + 0.07402i
0	-0.07402 − 0.07402i
	-392 + 850.7i
	-392 − 850.7i
	-2199
	-471.2

Nanometrics Trillium 120P

Sample rates: 100 sps
Sensitivity: 1201 V/(m/s) at 1 Hz

Poles and zeros (5 zeros, 7 poles)

LAPLACE (RADIANS/SECOND), A0 = 308000 at 1 Hz

Zeros	Poles
0	-0.03852 + 0.03658i
0	-0.03852 − 0.03658i
-90	-178
-160.7	-135 + 160i
-3108	-135 − 160i
	-671 + 1154i
	-671 − 1154i

SARA GEO-S120

Sample rates: 100 sps
Sensitivity: 1200 V/(m/s) at 5 Hz

Poles and zeros (2 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 532389 at 5 Hz

Zeros	Poles
0	-0.0329832
0	-0.0329832
	-729.61
	-729.61

Geotech KS-2000

Sample rates: 100 sps
Sensitivity: 2000 V/(m/s) at 0.1 Hz

Poles and zeros (2 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 98533.4 at 0.1 Hz

Zeros	Poles
0	-0.036 + 0.038i
0	-0.036 − 0.038i
	-222 + 222i
	-222 − 222i

Nanometrics Trillium 120PH

Sample rates: 100 sps
Sensitivity: 1202.5 V/(m/s) at 1 Hz

Poles and zeros (6 zeros, 11 poles)

LAPLACE (RADIANS/SECOND), A0 = 8.31871e+17 at 1 Hz

Zeros	Poles
0	-0.036614 + 0.037059i
0	-0.036614 − 0.037059i
-31.63	-32.55
-160	-142
-350	-364 + 404i
-3177	-364 − 404i
	-1260
	-4900 + 5200i
	-4900 − 5200i
	-7100 + 1700i
	-7100 − 1700i

SARA S100

Sample rates: 100 sps
Sensitivity: 1500 V/(m/s) at 1 Hz

Poles and zeros (3 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 625 at 1 Hz

Zeros	Poles
0	-1.1317
0	-606.4
0	-0.196
	-2.45

Accelerometers

Nanometrics Titan

Sample rates: 100 sps
Sensitivity: 2.04 V/(m/s²) at 1 Hz

Poles and zeros (1 zeros, 6 poles)

LAPLACE (RADIANS/SECOND), A0 = 1.00773e+18 at 1 Hz

Zeros	Poles
-515	-977 + 328i
	-977 − 328i
	-1486 + 2512i
	-1486 − 2512i
	-5736 + 4946i
	-5736 − 4946i

Güralp CMG-5TD

Sample rates: 200 sps
Sensitivity: 1.02 V/(m/s²) at 1 Hz

Poles and zeros (0 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 3.02202e+12 at 1 Hz

Zeros	Poles
	-400.8 + 567.87i
	-400.8 − 567.87i
	-1317.3
	-4748.4

Güralp CMG-5T

Sample rates: 100, 200 sps
Sensitivity: 1.02 V/(m/s²) at 1 Hz

Poles and zeros (0 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 3.02202e+12 at 1 Hz

Zeros	Poles
	-400.8 + 567.87i
	-400.8 − 567.87i
	-1317.3
	-4748.4

Kinemetrics EpiSensor

Sample rates: 100 sps
Sensitivity: 0.2549 V/(m/s²) at 1 Hz

Poles and zeros (0 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 2.45957e+13 at 1 Hz

Zeros	Poles
	-981 + 1009i
	-981 − 1009i
	-3290 + 1263i
	-3290 − 1263i

Güralp Fortis

Sample rates: 100 sps
Sensitivity: 1.02 V/(m/s²) at 1 Hz

Poles and zeros (0 zeros, 4 poles)

LAPLACE (RADIANS/SECOND), A0 = 3.02202e+12 at 1 Hz

Zeros	Poles
	-400.8 − 567.87i
	-400.8 + 567.87i
	-1317.38
	-4748.4

GEObit GEObit FBA200

Sample rates: 200 sps
Sensitivity: 1.01968 V/(m/s²) at 1 Hz

Poles and zeros (0 zeros, 2 poles)

LAPLACE (RADIANS/SECOND), A0 = 1.063e+6 at 1 Hz

Zeros	Poles
	-684.5 + 771.66i
	-684.5 − 771.66i

Digitisers

Nanometrics Centaur

Sample rates: 100 sps
Gain: 400 000 counts/V

Earth Data PS6-24

Sample rates: 100 sps
Gain: 400 000 counts/V

Geotech DR24

Sample rates: 100 sps
Gain: 263 274 counts/V

Güralp DM-24

Sample rates: 100 sps
Gain: 312 500 counts/V

REF TEK RT130

Sample rates: 100 sps
Gain: 629 129 counts/V

Geotech SMART24

Sample rates: 100 sps
Gain: 305 810 counts/V

REF TEK RT130S

Sample rates: 100 sps
Gain: 366 972 counts/V

SARA GEOsix

Sample rates: 100 sps
Gain: 754 100 counts/V

SARA SRi32S

Sample rates: 100 sps
Gain: 838 861 counts/V

Earlier instruments

Recorded in the NOA-IG station history but not in the current GEIN EIDA Node metadata.

SeisComP SCP

A SeisComP PC is used at each station. It supports the digitiser locally, and serves for communication connectivity and continuous control of the station instrumentation.

Quanterra Q52K

Quanterra Q680

Quanterra Q4120

GR12

Güralp CMG-40TDE/60

Equipment Details

Seismometers

Streckeisen STS-2

Nanometrics Trillium Cascadia

Güralp CMG-3ESP (120 s)

Güralp CMG-3ESP (60 s)

Lennartz LE-3D/20s

Güralp CMG-40T (60 s)

Güralp CMG-40T (30 s)

Nanometrics Trillium Horizon 120

Güralp CMG-3T

Nanometrics Trillium 120P

SARA GEO-S120

Geotech KS-2000

Nanometrics Trillium 120PH

SARA S100

Accelerometers

Nanometrics Titan

Güralp CMG-5TD

Güralp CMG-5T

Kinemetrics EpiSensor

Güralp Fortis

GEObit GEObit FBA200

Digitisers

Nanometrics Centaur

Earth Data PS6-24

Geotech DR24

Güralp DM-24

REF TEK RT130

Geotech SMART24

REF TEK RT130S

SARA GEOsix

SARA SRi32S

Earlier instruments

SeisComP SCP

Quanterra Q52K

Quanterra Q680

Quanterra Q4120

GR12

Güralp CMG-40TDE/60

Streckeisen STS-1

Geotech S13

Lennartz Le3D/1s

Geotech A900

Kinemetrics QDR

Güralp CMG-5TC

Kinemetrics Etna2