Geo Hazards Identified during Geophysical Investigations on Baltic Sea Shelf

The problem of detection and detalied characterization of geo hazards is successfully solved by geophysical investigations at the stage og geological engineering surveys.The main geophysical investigations is marine magnetic survey,subbottom profiling and side-scan sonar survey.The aim of geophysical investigations in Baltic sea is study of geological conditions and factors(geo hazard) that may cause a risk for positioning jackup rigs at the point of drilling exploration wells.The report presents results of marine magnetic,sonar surveys and subbottom profiling on the research area.Geotechnical sampling data is used forqualitative interpretation of subbottom profiling data.Combined geophysical and geological data interpretation has allowed to identified following geo hazards: acoustic anomalies,seafloor roughness (hills, ledges),current marks,boulders and their clasters.Identified geological and geotechnical hazard can have an adverse effect for positioning of jackup rigs at the point of drilling exploration wells.