Geotech Instruments, LLC 

Broadband Borehole Seismometer

Model KS-54000-IRIS

   

  • Ultra low noise 
  • Three-component system 
  • 0.003 to 5 Hz 
  • Cased borehole installation 

Geotech's Model KS-54000-IRIS is a borehole, three-component seismometer, designed for ultra low-noise monitoring for frequencies from 0.003 to 5 Hz, being below the Low Noise Model for the whole frequency band. It was developed in a joint effort with IRIS to fill the need for a cost-effective version of the KS-36000 seismometer which preceded it. The KS-54000 instruments have been a vital component in the test ban monitoring programs.  

Typical installations are in cased boreholes at depths of approximately 100 m for maximum isolation from cultural surface noise. A less expensive version, the KS-54000-P Posthole sensor, is designed for installations approximately 10 m deep where surface noise is not a consideration. 

   

TECHNICAL SPECIFICATIONS

OPERATING CHARACTERISTICS

Configuration

Number of outputs and Type
Sensitivity
Response
Distortion
Noise
Leve
l
Output, Mass Monitor
Sensitivity
Response
Level
Calibration Input
Resistive Mode
Capacitive Mode
Type
Level
Power Requirements
Operating
Installation

   - Three-component 

- Three, differential 
- 2400 V/(m/sec) 
- Flat to velocity, 0.003 to 5 Hz 
- Less than 100 ppm to ½ full scale 
- Below the USGS Low Noise Model in the passband 
- 40 Vp-p, maximum 

- Three, single-ended 
- 510 V-sec²/m 
- Flat to acceleration, DC to 5 Hz 
- 20 Vp-p, maximum 

- Equivalent to flat earth acceleration 
- Equivalent to flat earth velocity 
- Voltage - sine wave, pulse, etc. 
- 20 Vp-p, maximum 

- 24 Vdc, 100 mA, nominal 
- 24 Vdc, 450 mA, typical

ENVIRONMENTAL CHARACTERISTICS

Operating Temperature
Storage Temperature
Borehole Tilt
Borehole Casing
Hydrostatic Pressure

   - -25 to +60 ºC, non-condensing 
- -55 to +85 ºC 
- Less than 10 degrees 
- API 7 in., 6 in. (15 cm) minimum I.D. 
- Non-submersible

   PHYSICAL CHARACTERISTICS 

Dimensions
Height
Diameter

Net Weight
Shipping Data
Weight
Volume

  
- 249 cm (98 in.), with pilot 
- 13.7 cm (5.38 in.), nominal 
- 14.9 cm (5.88 in.), maximum with key 
- 66 kg (145 lbs.) 

- 227 kg (500 lbs.) 
- 1.45 m³

 
A complete line of ancillary equipment is available for cased boreholes of various sizes.