Expedition 358 drilling sequence

  • BOP setting on the ocean bottom
  • Ultra deep drilling
  • Sample return from plate boundary
  • Onboard analysis
Nankai Trough Seismogenic Zone Experiment drilling expeditions have reached the final phase this October. About 11 years have passed since the first IODP (International Ocean Discovery Program) operation by D/V Chikyu cruise in September 2007. So far D/V Chikyu has completed 15 expeditions, 68 holes, and drilled a total length of more than 34 km. IODP Site C0002 has been attempted three times before (IODP Exps. 326, 338 and 348), in steps, finally reaching 3,058.5 mbsf (meters below sea floor) during 348. The objectives of IODP Expedition 358 are to penetrate toward 5,300 m, to cross the high-amplitude seismic reflector where the main plate boundary fault is believed to exist, crossing by Real-Time M-LWD (Measurement-Logging While Drilling) and WL (Wire Line) operation, monitor mud gas and cuttings, and limited core sampling of the ultra-deep fault zone. These operations are extremely difficult tasks never before achieved due to the fragile geological formation comprising the accretionary prism, and factors including the powerful Kuroshio current, location subject to typhoon approaches, and also affected by the passage of multiple cold fronts during the Winter months. This expedition is the culmination of over 20 years of planning and 11 years of IODP NanTroSEIZE drilling efforts to reach the plate interface fault system at seismogenic/slow slip depths.
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  • Completed Expeditions
  • 2007
  • 2009
  • 2010
  • 2012
  • 2013
  • 2016
  • 2018