Geophysical Test Equipment

Seismic

Long Stroke Shaker

APS 400

• Trailer-mounted vibroseis
• Total weight: 3175.15 kg (7000 lb.)
• Mass and stroke optimized for surface wave testing
• Mass and base plate convertible for shear wave applications

• Frequency range: 0 to 200 Hz
• Force: 445 N (100 lbf)
• Maximum stroke: 158 mm (6.25 in.)
• Total mass: 73 kg ( weight 161 lb.)

• Frequency range: 0 to 200 Hz
• Force: 133 N (30 lbf)
• Maximum stroke: 158 mm (6.25 in.)
• Total mass: 36 kg (weight 80 lb.)

Seismograph

Geometrics Geode

Dynamic Signal Analyzer

Agilent 35670A

• 6, 24 channel seismic recorder units for a total of 144 channels, 10 meter spacing

• 25.6 kHz at 4 channels
• 1600 lines of resolution
• 90 db dynamic range

• 2, 6-channel seismic recorders
• Time accurate to better than 10 msec
• High performance/low power 24-bit

Instrumented Hammer

PCB 086C42 Impact Hammer

• Sensitivity: (±15%) 1 mV/lbf (0.23 mV/N)
• Measurement range: ±5000 lbf pk (±22000 N pk)
• Hammer mass: 5.5 kg (weight 12.1 lb)

Geophones and Seismometers

Borehole Geophone

Geostuff BHG-2

• 3 axis 14 Hz geophone
• Fits 5.1 cm (2 in.) to 18 cm (7 in.) borehole diameter
• Wall lock clamp
• 100 m cable
• BHGC-1 controller

Geoelectrical / geomagnetic

• Operating frequency: 9.8 kHz
• Measured quantities:
  • Quadrature: millisiemens per meter
  • Inphase: parts per thousand
• Resolution: +/- 0.1%
• Accuracy: +/- 5% at 20 mS/m
• Conduct: 10, 100, 1K mS/m

• 1000, 500, & 250 MHz antennas
• Digital Video Logger real time display
• EKKO software for data processing

• 28 channel, automatic switching 400 kW to 0.1 mW
• 0-500 V full scale autoranging (voltage)
• Input impedance: >20 M

Magnetometer

Proton precession, Geometrics G-856

• Resolution: 0.1 nT
• Accuracy : 0.5 nT
• Tuning: Auto or manual, range 20,000 to 90,000 nT