Aquarius - Liber Ocean Bottom Seismometer
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.
Fully operational at +/- 90 degrees, the Aquarius OBS system is a compact, free-fall seismic underwater observatory, ideal for free-fall deployment onto the sea floor at depths of up to 6000 m. The low profile and compact design is optimised to minimise the noise generated by the current flow whilst reducing transportation and deployments costs.
The seismometer has a flat response between 120 s and 100 Hz, with a user-selectable long-period corner from 120 s to 1 s, so you can tailor the response to the environment. Additional sensors including an APG and a Hydrophone are also incorporated into the system.
The acoustic telemetry is used, following deployment, to transfer state-of-health parameters and noise performance plots from the seabed, select the desired response of the sensor and to measure the time offset of the digitiser housed in the OBS pressure vessel. If desired, there are options to utilise the acoustic telemetry to transmit triggered event data to a receiver located at the surface on a buoy or rig in near-real-time for alert applications.
Once on the seabed, the Aquarius can be accurately located using integrated location and ranging software. It is also compatible with Sonardyne USBL systems.
The Aquarius recovery system is initialised either via the acoustic link, through a pre-programmed time-out, or with the optional critical level battery trigger. Once activated, a burn-wire system releases the ballast for recovery of the instrument and a satellite tracking system tracks the instrument on the sea surface.
- Local and regional seismic research
- Energy exploration
- Carbon storage
- Noise surveys
- Aftershock monitoring
- Earthquake/Tsunami Early Warning
- The advanced triaxial, broadband seismometer is fully operational at ±90 °, making it ideal for free-fall deployment onto the sea floor at depths of up to 6000 m
- A three-axis magnetometer and a MEMS accelerometer record the seismometer’s 3D position on the seabed for data rotation during post-processing
- The seismometer has a flat response between 120 s and 100 Hz, with a user-selectable long-period corner from 120 s to 1 s, so you can tailor the response to the environment
- Battery is sized to record seismic data for up to 18 months, with options to extend this if required
- Using acoustic telemetry, transfer state-of-health parameters and noise performance plots from the seabed; select the desired response of the sensor and; measure the time offset of the digitiser housed in the OBS pressure vessel
- Options to utilise acoustic telemetry to transmit triggered event data to a receiver located at the surface on a buoy or rig in near-real-time for alert applications
- Data transmission between the surface and the Aquarius on the seafloor at up to 9000 bps using the direct acoustic communication
- Aquarius is fitted with an absolute pressure gauge (APG) and a hydrophone. with options to upgrade these if desired e.g. for tsunami detection
- Data are stored locally in a dual redundant 128 GB Micro-SD card and can be downloaded using a Gigabit Ethernet after recovery
- A single cable connecting the Aquarius to the Güralp deck unit powers the system for data retrieval and system configuration. This allows for separate and concurrent charging of the batteries via a dedicated connector to an external charger, so that the system can be re-deployed as rapidly as possible
- The system is equipped with rechargeable lithium-ion batteries for fast and easy re-deployments, equating to approximately one hour to re-charge, for each month deployment