Geotech Instruments, LLC

Very Broadband Seismometer

KS-54000/KS-1

   

  • Ultra low noise 
  • Three-component system 
  • 0.003 to 5 Hz (optional up to 16 Hz for acceleration response)
  • Cased borehole installation (KS-54000) or vault installation (KS-1)

Geotech's Model KS-54000 is a borehole, Model KS-1 a vault, three-component seismometer, designed for ultra low-noise monitoring for frequencies from 0.003 to 5 Hz, being below the Low Noise Model for frequencies up to 5 Hz. The KS-54000 instruments have been a vital component in the test ban monitoring programs, as well as in global seismologiy studies.

Typical installations are in cased boreholes at depths of approximately 100 m to maximize 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. 

 

 

 

 

KS-1 sensor package

 

 

 

KS-1 electronics

   

TECHNICAL SPECIFICATIONS

OPERATING CHARACTERISTICS

Configuration

Number of outputs and Type
Sensitivity
Response
Distortion
Noise

LevelOutput, Mass Monitor
Number and Type
Sensitivity
Response
Level
Calibration Input
Resistive Mode
Capacitive Mode
Type
Level
Power Requirements
Operating
Installation

   - Three-component

- Three, differential 
- 15,000 V/(m/sec²) or 2,400 V/(m/sec); other values possible
- Flat to velocity or acceleration, 0.003 to 5 Hz (or 16 Hz)
- Less than 100 ppm to ½ full scale 
- Below USGS Low Noise Model from 0.003 to 5 Hz

- 40 Vp-p, maximum 
- Three, single-ended 
- 510 V/(m/sec²) 
- 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-convecting 
- -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.