Marine geohazards are sudden and extreme geologic events that affect coastal areas and seabed infrastructure on local, regional, and transoceanic scales. The hazards include submarine earthquakes, explosive volcanic eruptions and collapses of volcanic edifices, submarine slope failures, and tsunami generation. The sediment record of past offshore and coastal hazardous events is often better preserved in the marine/ lacustrine environment than on land and can be investigated in great detail with high-resolution geological and geophysical methods. We seek contributions that highlight new results and methodologies in marine paleoseismology, submarine landslide studies, tsunami generation and volcanic eruptions. We also emphasize studies that span the major process domains (e.g., the shoreline and the shelf-edge) of both active and passive continental margins, studies that provide constraints on recurrence intervals for hazardous events, and studies that link fundamental geological processes to the assessment of marine geohazards.