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Volume 24 | Copyright
Sci. Dril., 24, 93-107, 2018
https://doi.org/10.5194/sd-24-93-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Workshop report 22 Oct 2018

Workshop report | 22 Oct 2018

IODP workshop: Core-Log Seismic Investigation at Sea – Integrating legacy data to address outstanding research questions in the Nankai Trough Seismogenic Zone Experiment

Anna Cerchiari1, Rina Fukuchi2, Baiyuan Gao3, Kan-Hsi Hsiung4, Dominik Jaeger5, Shunya Kaneki6, Jonas Keller5, Gaku Kimura7, Szu-Ting Kuo8, Gaël Lymer9, Tatiana Maison10, Ginta Motohashi11, Christine Regalla12, Drake Singleton13, and Suguru Yabe14 Anna Cerchiari et al.
  • 1Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Modena, 41125, Italy
  • 2Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, 277-8564, Japan
  • 3Department of Geological Sciences, Institute for Geophysics, The University of Texas at Austin, Austin, TX 78712, USA
  • 4Research and Development Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan
  • 5Department of Geology, University of Innsbruck, Innsbruck, 6020, Austria
  • 6Department of Earth and Space Sciences, Osaka University, Osaka, 560-0043, Japan
  • 7Department of Marine Environment and Resources, Tokyo University of Marine Science and Technology, Tokyo, 108-8477, Japan
  • 8Department of Geology and Geophysics, Texas A&M University, TX 77843, USA
  • 9Earth Sciences Research Group, University of Birmingham, Birmingham, B15 2TT, UK
  • 10UMR 2018.C100 Basins-Reservoirs-Resources (B2R), UniLaSalle, UPJV, Beauvais, 60026, France
  • 11Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-0006, Japan
  • 12Department of Earth and Environment, Boston University, Boston, MA 02215, USA
  • 13Department of Geological Sciences, San Diego State University, San Diego, CA 92182, USA
  • 14Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology, Kanagawa, 237-0061, Japan

Abstract. The first International Ocean Discovery Program (IODP) Core-Log-Seismic Integration at Sea (CLSI@Sea) workshop, held in January–February 2018, brought together an international, multidisciplinary team of 14 early-career scientists and a group of scientific mentors specialized in subduction zone processes at the Nankai Trough, one of the Earth's most active plate-subduction zones located off the southwestern coast of Japan. The goal of the workshop was to leverage existing core, log, and seismic data previously acquired during the IODP's Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), to address the role of the deformation front of the Nankai accretionary prism in tsunamigenic earthquakes and slow slip in the shallow portion of the subduction interface. The CLSI@Sea workshop was organized onboard the D/V Chikyu concurrently with IODP Expedition 380, allowing workshop participants to interact with expedition scientists installing a long-term borehole monitoring system (LTBMS) at a site where the workshop's research was focused. Sedimentary cores from across the deformation front were brought onboard Chikyu, where they were made available for new description, sampling, and analysis. Logging data, drilling parameters, and seismic data were also available for investigation by workshop participants, who were granted access to Chikyu laboratory facilities and software to perform analyses at sea.

Multi-thematic presentations facilitated knowledge transfer between the participants across field areas, and highlighted the value of multi-disciplinary collaboration that integrates processes across different spatiotemporal scales. The workshop resulted in the synthesis of existing geophysical, geologic, and geochemical data spanning IODP Sites C0006, C0007, C0011 and C0012 in the NanTroSEIZE area, the identification of key outstanding research questions in the field of shallow subduction zone seismogenesis, and fostered collaborative and individual research plans integrating new data analysis techniques and multidisciplinary approaches.

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Subduction zones can potentially generate disastrous earthquakes and tsunamis in populated coastal areas. This report summarizes the research activity of a team of 14 early-career scientists who met during IODP Expedition 380 onboard D/V Chikyu (January–February 2018). The goal of this Core-Log-Seismic Integration at Sea workshop was to leverage IODP archives to address the mechanisms of tsunamigenic earthquakes at one of the most active subduction zones offshore southwestern Japan.
Subduction zones can potentially generate disastrous earthquakes and tsunamis in populated...
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