Autonomous
bottom seismic station ABSS-1
• OBS has been tested in Black Sea
and Mediterranean Sea.
• Marine operations in Mediterranean
Sea 2003, investigations of sediments and basement, 21 deployments. • Marine
operations in Indian Ocean Nov. 2003 – Feb. 2004, seismic investigations of
crust structure. 101 deployments.
• Geophysical investigations in
Pacific Ocean, 2006, 40 OBSs
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Carrier:
Aluminium sphere 450 mm
Max depth 6 000 m
Weight in air without anchor 40 kg
Anchor weight 40 kg
Buoyancy > 7 kg
Height 700 mm
Diameter 560 mm
mmersion velocity 1,7 m/s
Emersion velocity 1,0 m/s
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Hydro acoustic release:
Distance 8000 m
Distance measurement accuracy 15 m
Autonomous power supply 12 V
Emergency triggering by autonomous
timer
Seismometers:
3D seismometer in gamble (up to 450
inclination)
Geophone sensitivity 2000 V/m/s
Hydrophone sensitivity 25 mkV/Pa
Frequency range 1 – 125 Hz (0,5 - 40
Hz optional)
Seismo-acoustic frequency range 1,0 …
1000 Hz
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Onboard equipment:
GPS block for OBS starting and
synchronization
Data transmission from OBS FL ASH
memory to PC HDD
Shipboard unit & hydroacoustic
antenna with cable for the hydroacoustic release control
Power consumption 3,2 W
Record time: Min (2 ms) 110 hours
(4,5 days) Max (16 ms) 744 hours (30 days) Power supply - rechargeable battery 6
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Digital recorder:
4-th channel ADC 24 bits
Sampling rate 2, 4, 8, 16 ms
Accuracy of the precise time
generator 10 sec
FLASH memory 2 Gb (optionally 4 - 20
Gb)
3D compass, accuracy ± 2°
Temperature sensor, accuracy ± 0,1°Ñ,
switch on/of by timer
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