Mud Volcanic Geology -- New Seismic Neogene Clay Diapirs and Hydrocarbon Implications in the North-Eastern African Margin of Tunisia -- Seismic Signature of Gas Hydrate and Mud Volcanoes of the South African Continental Margin -- Global Distribution of Mud Volcanoes and Their Significance in Petroleum Exploration as a Source of Methane in the Atmosphere and Hydrosphere and as a Geohazard -- Sty…