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 Media Release

Ocean Networks Canada (ONC), a University of Victoria initiative, successfully deployed a string of three cabled Güralp Maris ocean bottom seismometer (OBS) as part of the first leg of their 2018 ‘Wiring the Abyss’ expedition aboard Canadian Coast Guard Ship the 'John P. Tully'.

The deployment formed part of a two week project to install and improve instrumentation on the offshore cabled observing networks at Barkley Canyon, Cascadia Basin, Endeavour and Clayoquot Slope in the Northeast Pacific Ocean. The Güralp OBS were deployed at Endeavour, the northern segment of the Juan de Fuca Ridge, a divergent boundary between the Pacific and Juan de Fuca tectonic plates. The instruments were positioned at a depth of approximately 2200 m adjacent to hydrothermal vents that have formed along the ridge, and were lifted into place using the Canadian Scientific Submersible Facility’s remotely operated vehicle for ocean science—ROPOS.

One of benefits of the Güralp Maris instrument for this type of deployment is the unique capability of the sensor to operate at any angle. This functionality allows for greater flexibility when installing the instruments in environments where precise alignment and levelling present more of a challenge.

During the deployment of the string, which took place on the 29th June and was streamed live via the ONC website, Güralp engineers were able to watch the installation as it happened, and provide advice to the scientific team on board the expedition vessel, led by ONC staff scientist, Dr. Martin Heesemann. The process of siting, connecting and testing the three seismometers and an interface unit took around five hours to complete. The data from the network will be publicly available via the Incorporated Research Institutions for Seismology (IRIS) from August.

Martin Heesemann, Staff Scientist at Ocean Networks Canada commented:

“Ocean Networks Canada’s (ONC) real-time network spans all of the dynamic and rugged tectonic regimes off Canada’s west coast capable of generating megathrust earthquakes, including the mid-ocean ridge at Endeavour, fracture zone and subduction zones at Barkley Canyon and Clayoquot Slope. Güralp has been providing world-leading technology and expertise to ONC since we began “Wiring the Abyss” in 2009.”

The incredible live footage of the installation was watched by Giorgio Mangano, Head of Ocean Systems at Güralp:

“Being able to watch the live installation video from the ROV and having direct communication with the ONC's team onboard the ship, it allowed us to provide some advice about the placement of the sensors and to help the scientists to fix simple issues during the process. Having seen how rocky and uneven the area was, we are glad to have developed the Maris, a broadband seismometer able to work at any angle without the need of gimbals. Where possible, the form factor of this sensor helps to easily bury it into the soft sediments, for best noise performances”.

A few days prior to this deployment a single, autonomous Maris seismometer was deployed, and will record activity over the period of a year before retrieval. The addition of this three-seismometer string - plus a single autonomous seismometer - will provide a dense network of instrumentation at this spreading mid-ocean ridge to help us better understand large plate scale seismic activity.

You can watch video of the expeditions deployments here https://data.oceannetworks.ca/SeaTube?resourceTypeId=1000&resourceId=1001&diveId=2551&time=2018-06-27T12:10:10.000Z

The Maris string deployment is R2086 2018-06-29 03:02:32.

 

Güralp has designed, built and deployed a wide range of OBS systems, you can read more about our experience in this area in our OBS brochure.

Web Tool-basket-with-seismometer-and-interface-unitImage 2 ROPOS toolbox containing Maris OBS, interface unit and cabling

Web removal-of-seismometer-and-interface-unit-from-basket

Image 3 Removal of single Maris OBS and interface unit from toolbox 

Web Maris and interface unit

Image 4 Installed and connected Maris OBS and interface unit

All images courtesy of Ocean Networks Canada/CSSF

 ENDS

 

MEDIA ENQUIRIES TO:

pressenquiries@guralp.com

For urgent enquiries please call 020 3727 1000 and speak to Fergus Wheeler, Louisa Feltes or Jess Gill. 

 

IMAGES:

  • Image 1 Güralp Maris Seismometer being placed in position at 2200 m depth
  • Image 2 ROPOS toolbox containing Maris OBS, interface unit and cabling
  • Image 3 Removal of single Maris OBS and interface unit from toolbox
  • Image 4 Installed and connected Maris OBS and interface unit

NOTES TO EDITORS:

Güralp (www.guralp.com) is a leading global provider of sophisticated seismic monitoring solutions used to understand natural seismological events such as earthquakes, aftershocks and volcanos, as well as induced seismic events, or seismic signals, resulting from human activity.

Our solutions are used in research, civil and industrial applications to increase understanding, optimise processes and to protect people and the environment. Our equipment is installed in all major ocean basins and across all continents worldwide.

Our instruments range in performance from very low frequency, very low noise for global seismology to high dynamic range instruments for local, strong motion monitoring. Our sensors and can be supplied for deployment at the surface, in boreholes and on the ocean bottom. We also provide data acquisition equipment, power and communication accessories and data interpretation software.

Our services include installation and commissioning; network operation; repair and maintenance services; data processing and interpretation.

Headquartered in Reading, in the UK, we have been operating for more than 30 years and have established a global network of distributors who provide local customer support and sales services.

About Ocean Networks Canada

The University of Victoria’s Ocean Networks Canada monitors the west and east coasts of Canada and the Arctic to continuously deliver data in real-time for scientific research that helps communities, governments and industry make informed decisions about our future. Using cabled observatories, remote control systems and interactive sensors, and big data management ONC enables evidence-based decision-making on ocean management, disaster mitigation, and environmental protection.

The observatories provide unique scientific and technical capabilities that permit researchers to operate instruments remotely and receive data at their home laboratories anywhere on the globe in realtime. Data is collected on physical, chemical, biological, and geological aspects of the ocean over long time periods, supporting research on complex Earth processes in ways not previously possible. These facilities extend and complement other research platforms and programs, whether currently operating or planned for future deployment.

Share our website www.oceannetworks.ca

And join Ocean Networks Canada expeditions LIVE through our website and on social media using hashtag #ONCabyss

Media Release

Güralp Liber Ocean Bottom Seismometers record migration calls of pygmy blue whales off the coast of Australia and pave way for environmentally responsible exploration.

A fleet of Güralp Liber Ocean Bottom Seismometers (OBS) maintained by Geoscience Australia, funded through AuScope and managed by ANSIR - Research Facilities for Earth Sounding, have recorded the calls of pygmy blue whales as they migrate along the Western Australia coast. As well as demonstrating that the whales stay further from the coast than previously thought, the research has identified an opportunity to test seismic source modelling to ensure environmentally responsible exploration.

The Australian Liber OBS that were deployed are housed in titanium and can remain on the seafloor continuously recording for up to 12 months. They can be commanded to return to the surface using an acoustic communication link. Each OBS incorporates a Güralp 6T-OBS 3-component broadband (0.0167 Hz–100 Hz) seismometer, with a titanium housing; and a hydrophone (2Hz–30KHz) attached to the fourth channel.

The pygmy blue whale calls were recorded on several OBSs on both the broadband seismometers and the hydrophones during a marine seismic survey in 2014-15 that utilised an airgun array as a seismic source. You can listen to an extract of whale calls here, as recorded on the seismometer:



 

It is well established that pygmy blue whales migrate along the Western Australia coast from feeding grounds in the Southern Ocean to breeding grounds in the tropical Indian Ocean although the width of the migration corridor is uncertain. It was believed the whales tend to stay mainly at the edge of the continental shelf during their journey, approaching the coast only in the southern migration leg in November–December at Geographe Bay, Western Australia.

In a project at Curtin University led by Prof Alexander Gavrilov with Garrick Paskos and Alexey Goncharov of Geoscience Australia, hydrophone data from fourteen of the Australian OBSs were processed using CHORUS software, which incorporates an automatic pygmy blue whale sound detector. The results clearly demonstrate that the whales tend to stay 300 to 400 km from the coast, and they rarely move inshore.

The recording of pygmy blue whale calls in the background of active marine survey noise further strengthens the case for using the OBS as a powerful environment monitoring and protection capability. Recording of airgun signals by the OBS allows estimating Sound Pressure Levels (SPL) and Sound Exposure Levels (SEL) to very large offsets exceeding 200 km in some cases. These values could be benchmarked against those predicted by seismic source modelling, and against marine mammals’ injury criteria. Australian OBS data from all new surveys could be made open file to allow further analysis to reduce speculation about the impact of seismic surveys’ noise on marine life.

Liber deployment


ENDS

MEDIA ENQUIRIES TO:

pressenquiries@guralp.com

For urgent enquiries please call 020 3727 1000 and speak to Fergus Wheeler, Louisa Feltes or Jess Gill. 

For further information about this study please contact alexey.goncharov@ga.gov.au


 
 

 

IMAGES:

Pygmy blue whale

Deployment of Liber OBS - image courtesy of Geoscience Australia

NOTES:

Güralp Systems Ltd.(www.guralp.com) is a leading global provider of sophisticated seismic monitoring solutions used to understand natural seismological events such as earthquakes, aftershocks and volcanos, as well as induced seismic events, or seismic signals, resulting from human activity.

Our solutions are used in research, civil and industrial applications to increase understanding, optimise processes and to protect people and the environment. Our equipment is installed in all major ocean basins and across all continents worldwide.

Our instruments range in performance from very low frequency, very low noise for global seismology to high dynamic range instruments for local, strong motion monitoring. Our sensors and can be supplied for deployment at the surface, in boreholes and on the ocean bottom. We also provide data acquisition equipment, power and communication accessories and data interpretation software.

Our services include installation and commissioning; network operation; repair and maintenance services; data processing and interpretation.

Headquartered in Reading, in the UK, we have been operating for more than 30 years and have established a global network of distributors who provide local customer support and sales services.

 

 

Address

 

Guralp Systems Limited
Midas House
Calleva Park
Aldermaston
Reading
RG7 8EA, UK

Tel: +44 118 981 9056
Fax: +44 118 981 9943
E-Mail: sales@guralp.com

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