OCEAN BOTTOM SEISMOMETERS (OBS)

Our range of OBS have been developed and enhanced over thirty years, with options for virtually every deployment scenario.

Tried and tested on successful deployments all around the globe, ours is the most comprehensive range of cabled and portable ocean bottom instruments available.

As well as housing truly broadband, triaxial sensors to capture the full seismic frequency range, a must for all seismic monitoring applications, we can also integrate additional sensors and gauges, vastly extending the application and capability of our OBS systems.

Aquarius

The revolutionary Aquarius is an evolution of our Liber ocean bottom seismometer, utilising acoustic telemetry capability to deliver near real-time seismic data from the ocean floor to the surface without cables.

Aquarius is a stand-alone free fall OBS with acoustic data telemetry for deployments at depths of up to 6000m for up to 18 months duration.

The system is available in two variants depending on the application and required timescales between battery charge.

Aquarius - for seismic research, when data transfer is needed only at the installation
and at the recovery of the OBS
Aquarius+ - for seismic research and alert, when data transfer is required either on trigger, or on demand at any point during the deployment window

Both systems are equipped with a digital feedback tri-axial broadband seismometer, operational at any angle and with a configurable long-period corner. A three-axis magnetometer and a MEMS accelerometer record the seismometer’s 3D position on the seabed for data rotation during post-processing.

An autonomous OBS system with acoustic telemetry for research applications when data transfer is needed only at the installation and at the recovery of the OBS.

The Aquarius battery is sized to record seismic data for 18 months and is equipped with an omnidirectional transducer for data transfer to ensure successful deployment.

State of Health parameters and noise performance data from the seabed are streamed following installation to confirm commencement of seismic recording.

At the end of the operation window, the acoustic link activates the burn-wire for release to the surface and an on-board satellite tracking system guides recovery.

An additional sensor can be fitted within the Aquarius canister such as a hydrophone or a high precision pressure sensor; or alternatively an external Absolute Pressure Gauge can be connected. The system is equipped with rechargeable lithium-ion batteries for fast and easy re-deployments (less than 12 hours needed to re-charge a flat system).

  • Compact OBS equipped with an acoustic modem  
  • Digital feedback tri-axial broadband seismometer, operational at any angle, with a flat response between 120s and 100Hz
  • A three-axis magnetometer and a MEMS accelerometer record the seismometer’s 3D position on the seabed
  • Transmission of State of Health parameters and noise performance data from the seabed following installation
  • Dual redundant 128 GB Micro-SD card
  • Gigabit Ethernet retrieval of data once recovered, with OBS powered using Power over Ethernet (PoE) to allow battery re-charge to commence simultaneously
  • Acoustic burn-wire release mechanism with satellite tracking system to guide recoveries, with location alerts sent via email, SMS and/or webpage

Designed for seismic research and alert applications, the Aquarius+ is equipped with a directional transducer for data transfer during deployment.

The Aquarius+ offers optional methods of data retrieval as follows:

  • The data logger automatically detects seismic events using a STA/LTA trigger. A compressed list of triggered events is rapidly sent to the surface by the acoustic link with minimum power requirement. The operator can then select which
    detailed event data is required for energy efficient transmission.

  • Alternatively, the operator can stream portions of seismic data from a time window selected using the Güralp software available on the surface.

Bi-directional communication with the underwater system allows interaction with the datalogger when the OBS is installed on the seabed, making it possible to change recording parameters and to check fundamental settings during the experiment (i.e. State of Charge of the battery pack).
The acoustic link activates the burn-wire for release to the surface and an on-board satellite tracking system guides recovery.

  • Compact OBS equipped with an acoustic modem  
  • Digital feedback tri-axial broadband seismometer, operational at any angle, with a flat response between 120s and 100Hz
  • A three-axis magnetometer and a MEMS accelerometer record the seismometer’s 3D position on the seabed
  • Transmission of State of Health parameters and noise performance data from the seabed following installation
  • Up to 9000 bps transmission of data between seabed and surface using acoustic communication
  • Aquarius+ automatically transmits compressed list of events detected using STA/LTA triggers, with option to request full data transmission for selected events
  • Dual redundant 128 GB Micro-SD card
  • Gigabit Ethernet retrieval of data once recovered, with OBS powered using Power over Ethernet (PoE) to allow battery re-charge to commence simultaneously
  • Acoustic burn-wire release mechanism with satellite tracking system to guide recoveries, with location alerts sent via email, SMS and/or webpage

Applications

Aquarius
  • Local and regional seismic research
  • Energy exploration
  • Noise surveys
  • Aftershock monitoring

Aquarius+
  • Local and regional seismic research
  • Earthquake/Tsunami Early Warning
  • Temporary or permanent seismic monitoring via acoustic link connection with buoys or rigs

Orcus

A real-time cabled OBS that sits fully or partially buried on the seafloor for depths of up to to 6000 m/19,685 ft

Depending on the deployment depth, housing is either duplex stainless steel or titanium to protect against corrosion. The unique spherical shape of the casing protects the instrument at high pressures, and an underlying metal plate ensures optimum ground coupling. An optional concrete dome hood can be employed to reduce noise and protect against trawling in shallower waters.

An integrated state of the art Güralp Affinity digitizer delivers data in real-time to the cable system. The frequency range of the sensor can be engineered to suit the requirements of the project. If more than one response range is required, additional sensors or hydrophones can be incorporated. Non seismic sensors, such as absolute pressure sensors for tsunami early warning can also be integrated.

Key features:

  • Suitable for depths of up to 6000 m (19,685 ft)
  • Cable-to-shore or cable-to-buoy system
  • Optional add-on sensors include absolute pressure sensor, hydrophone, current meter and thermometer
  • Aluminium or titanium housing for corrosion resistance and waterproofing
  • Optional concrete dome to reduce noise and protect against fishing trawlers
  • Data digitised at site with real-time streaming to onshore data centre
  • Digitizer timing synchronised with NTP or PTP protocols.
  • External sensors with Ethernet can use the same timing protocols
  • Flexibility to connect with a wide range of cable systems e.g. Ethernet or optic fibre
  • Constant power supply plus back-up battery
  • Deployment via winch with ROV support required for deeper installations
  • Robust self-levelling system

Applications

  • Cable to shore or cable to buoy systems
  • Real-time data streaming
  • Local, regional and teleseismic monitoring
  • Earthquake/Tsunami Early Warning

Maris

A real-time cabled OBS, pushed or cored into the seafloor, suitable for depths up to to 6000 m/19,685 ft

Housed in titanium or stainless steel, the Maris houses a broadband sensor that is fully operational at any angle to support versatile installations. Insertion into the seafloor minimises ambient noise to produce exceptional data quality and increase trawl resistance in shallower deployments. An internal magnetometer and MEMS accelerometer work together to automatically compensate for tilt and horizontal orientation to deliver high-quality waveforms.

The Maris system can be a single instrument or a string of up to eight instruments and includes the Minimus digitiser, housed in a seperate vessel, to deliver data over Ethernet direct to the cabling system. The Minimus also offers a low-latency mode running causal filters alongside traditional acausal filters for earthquake early warning applications. The frequency range of the broadband sensor can be engineered to suit the requirements of the project.

Key features:

  • Suitable for depths of up to 6000 m (19,685 ft)
  • Subsurface burial for improved data quality and trawl resistance
  • Easily strung together for daisy chain arrays 
  • Titanium or stainless steel casings
  • The system Minimus digitises data at site with real-time streaming over Ethernet to the onshore data centre
  • Optional low-latency mode running causal filters
  • Power and Ethernet stream via wet-mateable connector
  • Synchronised absolute time with onshore GPS
  • Flexibility to connect with a wide range of cable systems e.g. optic fibre
  • Deployment and cable installation via ROV

Applications

  • Pushed or cored into seafloor for improved coupling
  • ROV deployment
  • Cable to shore or cable to buoy systems
  • Real-time data streaming
  • Local, regional and teleseismic monitoring
  • Volcanic monitoring
  • Earthquake/Tsunami Early Warning

Breve

A rapid response OBS that is lowered on a winch into shallow water of up to 150 m /492 ft depth

The system is lowered to the seafloor using a winched cable which allows for accuracy of deployment location, whilst avoiding the requirement for specialist deployment vessels. The instrumentation is housed in a protective, waterproof, aluminium casing to protect the instrument from corrosion. On project completion, the system is recovered via an acoustic activated release buoy.

The frequency range of the sensor can be engineered to suit the requirements of the project. A hydrophone is incorporated, alternatively this channel can be used for another analogue sensor like a differential pressure gauge or an absolute pressure gauge.

Key features:

  • Maximum depth of 150 m (492 ft)
  • Sensor is operational at any angle
  • Simple deployment process via winched cable
  • Non specialist deployment vessels can be used
  • Minimal Linear clock drift: < 1 ms per day
  • Low-power electronics maximises battery power for continuous running durations of up to six months
  • Is equipped with a hydrophone
  • Aluminium housing material to protect instrument from water and corrosion
  • Acoustic mechanical release system

Applications

  • Shallow, temporary deployments
  • Local, regional seismic research
  • Oil and gas exploration

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Güralp Systems Ltd.
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Aldermaston, Reading
RG7 8EA
United Kingdom

Tel: 01189 819056
Email: sales@guralp.com
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