Seafloor Geodetic Observation

GPS/acoustic combination technique
A system for precise seafloor positioning using GPS/Acoustic Combination Technique has been developed by the Hydrographic and Oceanographic Department, Japan Coast Guard, in close collaboration with the Institute of Industrial Science, University of Tokyo. Accuracy of this positioning achieves several centimetres. Based on the system, seafloor reference points have been deployed on the landward slope of major trenches such as the Japan Trench and Nankai Trough to monitor crustal movement caused by subduction of the Oceanic Plate. Observations of undersea crustal movement will provide invaluable information on the physical state of the rupture zones of huge earthquakes distributed around the... (read more)
2008-01-01 01:00:00

Lidar Seafloor Classification

New Application for HawkEye II Airborne Lidar System
Airborne Lidar (Light Detecting and Ranging) is a well-established remote sensing technique which scans the terrain and seafloor with high-frequency laser pulses. Until now, bathymetric Lidar data has been processed to generate marine depth information and seafloor topography. However, Airborne Hydrography AB (AHAB) has developed a new method of processing data which allows information about the actual properties of the seafloor to be extracted. The accuracy and efficiency of reflectance imaging for seafloor classification is demonstrated here with data from coastal sites in both Massachusetts and Sweden. By Xin Liu, Andreas Axelsson and H. Michael Tulldahl, Sweden. With its advantage... (read more)
2011-05-17 04:02:56

GPS/Acoustic Seafloor Observation

Crustal Movement Around Japan
GPS/Acoustic Seafloor geodetic observation technique has made notable progress over recent years. Positional precision better than several centimetres has been attained through tremendous efforts to improve accuracy in both software and hardware. Some remarkable results have been obtained: intraplate crustal velocity off the Pacific coast of NE Japan caused by subduction, and co-seismic displacement associated with an earthquake in 2005 off Miyagi Prefecture. BackgroundThe idea for GPS/Acoustic combination technique to measure seafloor crustal movement dates back to early work done by scientists at the Scripps Institution of Oceanography in America. They started geodetic observations using this technique on the Juan... (read more)
2007-04-04 12:00:00

Seafloor Mining Tool Contract

Nautilus Minerals has announced the award of a contract worth approximately GBP33 million (USD66.5 million), to Soil Machine Dynamics of Newcastle upon Tyne (UK), for the design and build of two Seafloor Mining Tools (SMTs) and to provide a development update for its Solwara 1 Project, located in the territorial waters of Papua New Guinea.   According to David Heydon, Nautilus' CEO, this first order is a historic step in the creation of a new industry and a major milestone for the Nautilus team, who continue to meet the development timelines for the delivery of the Solwara 1 Project. Nautilus... (read more)
2008-01-02 10:36:22

IXSEA Seafloor Mapping Solutions

IXSEA launched its new seafloor mapping solutions at 0i08. These products offer integrated solutions, which combine sonar, seismic, gradiometer and magnetometer technologies and sensors to meet the different demands of seabed mapping and survey projects.   IXSEA provides a powerful suite of real-time data acquisition, processing and interpretation tools, designed by geophysicists and survey analysts. The data stream is channelled to edit mission reports in real-time and boost productivity. This software is compatible with other manufacturers' sensors and technologies.   From off-the-shelf advanced processing sonars to sub-bottom profilers, magnetometers to gradiometers, IXSEA provides ideal sensors and solutions depending on each... (read more)
2008-03-26 12:18:20

Seafloor Exploration in Malta

Against the backdrop of the WWI centenary, the second edition of the Seafloor Exploration training course was conducted in Malta during the first two weeks of September. Students spent ten days covering many different theoretical and practical aspects of seafloor mapping, including a one-day certified CARIS training course among other software and hardware tutorials. As part of field work, a day was spent surveying a newly discovered black coral reef on the southern coast with a remotely operated vehicle (ROV), piloted by Underwater Management Services' Pierre Bellizzi. The most exciting exercise of the training course was the expanded investigation of... (read more)
2015-01-05 05:03:07

Seafloor Systems Trimble Dealer

As of now, Seafloor Systems will market the complete line of Trimble GPS and hydrographic software products for the marine construction and hydrographic survey industries in the north western United States. The company will also offer Trimble HYDROpro Navigation software, a solution for marine construction applications that allows for significant improvements in productivity on complex marine projects. (read more)
2003-10-25 12:00:00

Acoustic Seafloor Classification

A simple model-based method for single-beam echo sounders
Acoustic seabed classification is becoming increasingly important for many fields, including marine geology, hydrography and navigation, coastal engineering, environmental sciences, marine biology and fisheries. The main advantages over conventional bottom grabs are the continuous, non-invasive probing of the seabed and a vast reduction in survey time and costs. The difficulty of acoustic methods is associated with complicated acoustic wave scattering off the rough and layered seabed, which makes interpretation of the received signals cumbersome. In other words: how do we retrieve bottom type from the echo characteristics? This is why acoustic seabed classification is still the subject of extensive research.... (read more)
2008-01-01 01:00:00

Rovdrill Contract for Seafloor Geoservices

Seafloor Geoservices Inc (SGI), part of the Triton Group, has entered into a deal with TSmarine to supply their new generation remotely operated seafloor geotechnical system for use in one of the world's largest mineral survey projects. The Rovdrill 3 system has been selected for the Nautilus Minerals 2010 seafloor massive sulphide (SMS) drilling programme in the Bismarck Sea, off Papua New Guinea. It is a third-generation remotely operated seafloor drilling system, with full geotechnical sampling and in-situ data acquisition capabilities, including the capability to drill 75mm core holes in excess of 100 metres deep.The drilling programme will focus on... (read more)
2010-07-14 04:53:53

Chart Shows Antarctic Seafloor Topography

Reliable information on the depth and floor structure of the Southern Ocean has so far been available for only a few coastal regions of the Antarctic. An international team of scientists under the leadership of the German Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, has succeeded in creating a digital map of the entire Antarctic seafloor. The International Bathymetric Chart of the Southern Ocean (IBCSO) for the first time shows the detailed topography of the seafloor for the entire area south of 60°S. An article presented to the scientific world by IBCSO has now appeared online in... (read more)
2013-04-26 12:00:00
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