Active gas seepage in western Spitsbergen fjords, Svalbard archipelago: spatial extent and geological controls

This study presents the first systematic observations of active gas seepage from seafloor in main fjords western Spitsbergen Svalbard archipelago. High-resolution acoustic water column data were acquired throughout two research cruises August 2015 and June 2021. 883 flares have been identified characterized Isfjorden, 115 Van Mijenfjorden. The hydroacoustic indicate fluid migration into column. Interpretation 1943 km regional offshore 2D seismic profiles supplemented existing geochemical by providing geological control on distribution source rocks potential pathways for fluids. In area, bedrock architecture controls deep rocks. Faults, high permeability layers, heavily fractured units igneous intrusions channel presented this are an important step towards assessment how near-shore impacts upon carbon budget fjords, which constitute a globally recognized early climate change warning system High Arctic.