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Russian Academy of Sciences

Experimental Design Bureau of

Oceanological Engineering

   
 Rambler's Top100

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

 

Autonomous bottom seismic station ABSS-1

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

 

 

Autonomous bottom seismic station ABSS-1

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

 

Autonomous bottom seismic station ABSS-1

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 V

Autonomous bottom seismic station ABSS-1

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, switch on/of by timer

 

Autonomous bottom seismic station ABSS-1  Autonomous bottom seismic station ABSS-1  Autonomous bottom seismic station ABSS-1  Autonomous bottom seismic station ABSS-1  Autonomous bottom seismic station ABSS-1

 

 

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