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Expedition result
CDEX plans to implement IODP Expedition 358: NanTroSEIZE Plate Boundary Deep Riser 4, beginning on 7 October 2018. The main expedition goal is to deepen riser hole C0002F/N/P from 3000 mbsf to the primary megathrust fault target at ~5200 mbsf, using logging-while-drilling (LWD), downhole measurements, and drill cuttings analysis extensively, in addition to limited coring intervals. This expedition will be the culmination of 10 years of IODP NanTroSEIZE deep drilling efforts to reach the plate interface fault system at seismogenic / slow slip depths.

IODP Site C0002 is the deep centerpiece of the NanTroSEIZE Project, intended to access the plate interface fault system at a location where it is believed to be capable of seismogenic locking and slip, and to have slipped coseismically in the 1944 Tonankai earthquake. This drilling target also is in close proximity to the location where a cluster of very low frequency (VLF) seismic events and the first tectonic tremor recorded in any accretionary prism setting has been found, all suggesting fault processes related to the up-dip limit of megathrust seismogenic mechanics are active here.

Drilling Sequences


The drilling operation passed a depth of 3058.5 m below seafloor, the former world record for the deepest scientific ocean drilling, on 3 December.
Data on formation properties of the geological strata have been successfully obtained by logging while drilling (LWD*).
*Measurement of formation properties such as resistivity and natural gamma ray while drilling using tools integrated into the bottom hole assembly.


Start: Move to Site C0002

Phase 1: BOP setting on the ocean bottom

- After moving vessel to Site C0002, riser Hole F/N/P, launch ROV (Remote Operating Vehicle) with transponders. Deploy total of 10 transponders as an array on the sea floor.
- Retrieve corrosion cap, place corrosion cap beside the well head by ROV.
- Run BOP and Riser.
- On the rig floor, prepare drill and make up tools and check connections.

Phases 2 & 3: Ultra-deep drilling & Sample return from plate boundary

Phase 4: Onboard analysis


"Supportvie Message to participants onboard "CHIKYU"

Send a warm message of support to the expedition participants aboard Chikyu working to achieve a new scientific "first" - sampling the plate boundary of a subducting plate, believed to be where large tsunamigenic earthquakes have slipped in the past.

These messages will be sent to Chikyu where they will be displayed aboard for all to see. Some will be selected for display here. We especially welcome English messages, since the official language aboard Chikyu is English.

Please be aware that messages could be selected for publishing here and on Chikyu - so if this is acceptable, feel free to submit your message!

Messages from the expedition Science Leadership

Part1 Gaku Kimura

>> Science Party

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