Published December 20, 2025 | Version Published
Book Section - Chapter Open

Expedition 405 methods

  • 1. ROR icon University of Nevada Reno
  • 2. ROR icon University of Tsukuba
  • 3. ROR icon University of Lorraine
  • 4. ROR icon Northern Arizona University
  • 5. ROR icon Japan Agency for Marine-Earth Science and Technology
  • 6. ROR icon RWTH Aachen University
  • 7. ROR icon University of California, Los Angeles
  • 8. ROR icon Géosciences Rennes
  • 9. ROR icon The Ohio State University
  • 10. ROR icon Grenoble Alpes University
  • 11. ROR icon Lamont-Doherty Earth Observatory
  • 12. ROR icon University of Washington
  • 13. ROR icon National Institute of Oceanography and Experimental Geophysics
  • 14. ROR icon Naruto University of Education
  • 15. ROR icon Heriot-Watt University
  • 16. ROR icon California Institute of Technology
  • 17. ROR icon Heidelberg University
  • 18. ROR icon Australian National University
  • 19. ROR icon Yamagata University
  • 20. ROR icon Geological Survey of Japan
  • 21. ROR icon Kobe University
  • 22. ROR icon University of Bremen
  • 23. ROR icon Kōchi University
  • 24. ROR icon United States Geological Survey
  • 25. ROR icon Spanish National Research Council
  • 26. ROR icon Kyoto University
  • 27. ROR icon Universität Innsbruck
  • 28. ROR icon Stony Brook University
  • 29. ROR icon Durham University
  • 30. ROR icon University of Colorado Boulder
  • 31. ROR icon University of Chieti-Pescara
  • 32. ROR icon University of California, Santa Cruz
  • 33. ROR icon The University of Texas at Austin
  • 34. ROR icon Utah State University
  • 35. ROR icon University of Wisconsin–Madison
  • 36. ROR icon University of California, Davis
  • 37. ROR icon GeoAzur
  • 38. ROR icon University of Tokyo
  • 39. ROR icon University of Montpellier
  • 40. ROR icon University of Leicester

Abstract

This chapter documents the methods used for shipboard measurements and analyses during International Ocean Discovery Program (IODP) Expedition 405, Tracking Tsunamigenic Slip Across the Japan Trench (JTRACK). We conducted riserless operations at Sites C0019 and C0026 (Table T1). Two temperature sensor observatories were installed at Site C0019. Logging while drilling and coring were performed at Sites C0019 and C0026. Methods for postexpedition research conducted on Expedition 405 samples and data will be described in individual scientific contributions published after the expedition.

All shipboard scientists contributed to the completion of this volume. Because of the long length of Expedition 405 (106 days, 6 September–20 December 2024), staffing was staggered. The shipboard science party was divided into two science party staffing windows. Window 1 included 26 scientists (6 September–30 October), and Window 2 included 25 scientists (25 October–21 December). The Window 1 to Window 2 handover occurred during a 6 day crossover period with staggered onboarding and offboarding. Six Co-Chief Scientists served in overlapping shifts of two or three at a time, and at least one Expedition Project Manager was on board at all times.

Copyright and License

Except where otherwise noted, this work is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/). Unrestricted use, distribution, and reproduction are permitted, provided the original author and source are credited.

Funding

Funded by JAMSTEC, ECORD, and NSF OCE1326927.

Supplemental Material

Supplementary material for the Volume 405 expedition reports includes daily reports, structural geology observation sheets, and hand-drawn VCDs in PDF; physical properties data, section summaries, and structure logs in Microsoft Excel format; smear slides in JPG and CZI formats; and thin sections in JPG format. A full list of directories can be found in SUPP_MAT in the volume zip folder or on the Supplementary material for Volume 405 expedition reports web page.

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Additional details

Related works

Is supplemented by
Supplemental Material: http://publications.iodp.org/proceedings/405/SUPP_MAT/index.html (URL)

Funding

Japan Agency for Marine-Earth Science and Technology
European Consortium for Ocean Research Drilling
National Science Foundation
OCE-1326927

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Caltech groups
Division of Geological and Planetary Sciences (GPS)
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Published