CDEX is implementing three Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) expeditions during 2010 and early 2011: Expedition 326 (NanTroSEIZE Stage 3: plate boundary deep riser: top hole engineering), Expedition 332 (NanTroSEIZE Stage 2: riserless observatory), and Expedition 333 (NanTroSEIZE Stage 2: subduction inputs 2 and heat flow).

The objectives for Expedition 333 are to core and measure temperature within the shallow intervals at Sites C0011 and C0012 that were not sampled during Expedition 322 and to collect up to 220 m of additional basement material from Site C0012 (Fig. F1). These are the two subduction inputs sites for the transect, positioned above and on the northwest flank of a prominent basement high in the Shikoku Basin. Additionally, the coring objectives of an Ancillary Project Letter (738-APL), NanTroSLIDE, will be attempted to help constrain the history of submarine landslides along the lower forearc slope as it may relate to slip along the megasplay fault.