Geohazards monitoring can benefit greatly from the integration of seafloor and land observations, because many of the most seismogenic zones and active volcanoes are situated in oceanic basins (NRC 2000). Similarly, many volcanic and seismic areas located in coastal zones extend their activities into nearby marine sectors. The known features of these marine activities are restricted to episodic events, and nothing much is known about the long-term processes. However, marine technology has advanced over the past two decades to the point where long-term and permanent observatories and networks are under development on the seafloor. This has allowed investigations...

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