"Dayang No. 1" completed three near-bottom magnetic line magnetometers imported from abroad
In the network lab at the bottom of the "Ocean No. 1", Wu Tao, who has been working for 24 hours, is still sitting in front of the computer and nervously handling the near-bottom magnetic data he just got. The doctoral student of the Second Institute of Oceanography of the State Oceanic Administration is the head of the near-bottom magnetometer for the second segment. "Ocean No. 1" has just completed three near-bottom magnetic lines.
The three lines were all carried out in the Longji hydrothermal area, the first hydrothermal area discovered in China. "The earth has a magnetic field, and the magnetometer is looking for anomalies in the hydrothermal zone based on changes in the magnetic field," Wu Tao explained. There are differences in the magnetic forces of rocks of different natures, such as the weak magnetic force of mica, and the magnetic force of rocks containing iron, cobalt and nickel is stronger. Different geological structures will also bring about changes in magnetic force, such as the geometrical differences caused by faults, and the magnetic force in cracks or gullies will be weak.
Magnetic surveys around the world come in many forms: aviation, land, ocean and logging. The magnetic survey of the ocean can be further divided into sea surface survey and near-bottom magnetic survey. Sea surface surveys are generally carried out on a larger scale, obtaining background data from a large area, mainly for large-scale geological structure studies, but near-sea surveys are more elaborate.
In the near-sea survey, the magnetometer is close to the seabed. For example, the magnetometer used in the â€œOcean No.1â€ is installed in the deep sea tow, and is lowered to 150-200 meters from the seabed by the cable, and dragged slowly. Conduct an investigation. "I hope to get the magnetic anomaly in the hydrothermal zone." Wu Tao said. According to him, in 2007, the Woods Hole Institute of the United States also conducted magnetic data collection in this area. The underwater robots they use can work 5 to 50 meters offshore.
The magnetometer used by "Ocean No. 1" is imported from abroad, and the deep sea tow body loaded with it is developed by the Second Institute of Oceanography of the State Oceanic Administration. It is a towless titanium alloy non-magnetic frame.
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