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Triple mass-transport deposits (MTDs) with areas of 625 494 and 902 km2, re spectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin.Based on high-resolution seismic reflection data and multi-beam bathy metric data, the Quaternary MTDs are characterized by typical geometric shapes and inter nal structures.Results of slope analysis showed that they are developed in a steep slope ranging from 5° to 35°.The head wall scar of the MTDs arrived to 50 km in length (from headwall to termination).