Development of a Shear Wave Structure Exploration System for Floating Offshore Wind Farms

As an offshore exploration system for floating offshore wind farms, we have developed a system to grasp the Vs structure up to 20 to 30 meters below the seafloor at depths of 50 meters or more. In order to conduct surface wave method on the seabed, we developed a seabed weight drop source and constructed a system that can observe surface waves by operating the source at the ends of ocean bottom seismometer array arranged in a line. Using this system, we carried out measurements at a test site in Japan at a water depth of 60m and confirmed that detailed Vs structure could be obtained down to 20m below the seabed.