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Geological hazards can be considered all phenomena or conditions (on land and offshore), natural or induced by human activity, that can produce damage and that geological information can be used to predict, prevent, or correct.

Marine scientists are interested in understanding the futures and processes that define a hazard; therefore, they classify the offshore geological hazard according to theri causes.

The most important and widespread marine geohazards are earthquakes, slope instabilities, submarine volcanism and processes related to fluid flow and bottom currents. Tsunamis deserve special mention because they are a secondary hazard derived from or generated by another event, especially earthquakes, landslides or volcanic eruptions.

Marine geohazards arise from different geomorphological and geological features that produce scenarios in which diverse processes may act alone or in combination with others, triggering a chain of events.