Abstract
About 150 circular, sub-circular or elongate high back-scattering patches have been identified on the crest and inner part of the Mediterranean Ridge accretionary complex by means of 6.5 kHz GLORIA long-range side-scan sonar. Some of the patches occur in groups or in ridge parallel alignments, associated with deep-seated structures. On the basis of core stratigraphy they have been interpreted as mud volcanoes and mud ridges, with surface or near surface mud breccia. It seems that mud volcanoes are not imaged by GLORIA, if there is a cover of more than about 2 m of pelagic sediments. GLORIA records show that mud diapirism is more common on the crest and inner part of the Mediterranean Ridge, where the covering Messinian salt is thinner and the deep-seated structures can cut it.
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