International Ocean Discovery Program
Expedition 405 Preliminary Report
Tracking Tsunamigenic Slip Across the Japan Trench (JTRACK)1
6 September 2024–20 December 2024
Jamie Kirkpatrick, Christine Regalla, Marianne Conin, Patrick Fulton, Kohtaro Ujiie, Shuichi Kodaira, Natsumi Okutsu, Lena Maeda, Sean Toczko, Nobu Eguchi, and the Expedition 405 Scientists
1 Kirkpatrick, J., Regalla, C., Conin, M., Fulton, P., Ujiie, K., Kodaira, S., Okutsu, N., Maeda, L., Toczko, S., Eguchi, N., and the Expedition 405 Scientists, 2025. Expedition 405 Preliminary Report: Tracking Tsunamigenic Slip Across the Japan Trench (JTRACK). International Ocean Discovery Program. https://doi.org/10.14379/iodp.pr.405.2025
Abstract
The extremely large slip that occurred on the shallow portion of the Japan Trench subduction zone during the 2011 Mw 9.1 Tohoku-oki earthquake directly contributed to the devastating tsunami that inundated the Pacific coast of Japan. International Ocean Drilling Program (IODP) Expedition 405 aimed to investigate the conditions and processes that facilitated the extremely shallow slip on the subduction interface during the 2011 Tohoku-oki earthquake to improve understanding of the factors that slip to the trench on subduction zones. Expedition 405 implemented a combined logging, coring, and observatory operational plan at two sites: Site C0026 ~8 km seaward of the Japan Trench to characterize the input sediments to the subduction zone and Site C0019 ~6 km landward of the trench where the plate boundary fault zone is present at ~825 meters below seafloor (mbsf). At Site C0026, the input section was logged to ~430 mbsf with a logging-while-drilling (LWD) assembly that characterized the succession of sediments and rocks from the seafloor to the basaltic rocks of the oceanic crust. Cores recovered from four holes as deep as 290 mbsf contain a sequence of hemipelagic and pelagic sediments that will be input into the shallow subduction system and therefore control both the localization of the plate boundary fault zone and the slip behavior of the plate boundary. Site C0019 was previously drilled in 2012 during Integrated Ocean Drilling Program Expedition 343 (Japan Trench Fast Drilling Project [JFAST]), so revisiting this site allowed temporal variations in the frontal prism and plate boundary fault zone to be evaluated. The LWD data to ~960 mbsf characterized the frontal prism, plate boundary fault zone, and lower plate to the basaltic volcanic rocks. Cores were recovered from multiple holes that contain a variety of muds from the frontal prism and the plate boundary fault zone, as well as lower plate materials. Comparison with the sediments from Site C0026 provides a basis to interpret the tectonic and sedimentological processes operating in the dynamic environment of the frontal prism. Cores from the plate boundary fault zone provide a unique window into the structural complexity of an active plate boundary fault that is known to host large seismic slip. Two borehole observatories were installed at Site C0019 that contain temperature sensors deployed to measure temperature over a period of years and reveal the hydrogeologic structure of the shallow subduction system. These hugely successful drilling operations, combined with postexpedition work to measure the mechanical, frictional, paleomagnetic, and hydrogeologic properties of the core samples and to constrain the history of past seismic slip at Site C0019, provide an unprecedented opportunity to advance our understanding of shallow subduction systems. Outreach during the expedition leveraged and elevated the success of the operations by sharing the outcomes with diverse domestic and international audiences, including scientists, students, educators, stakeholders, and the general public. Thanks to the efforts of a large group of onboard outreach officers and their onshore support, activities included ship-to-shore broadcast events; interviews with science party members and crew; the publication of videos, blogs, magazine articles, and social media posts; and development of formalized classroom lesson plans and materials.
Plain language summary
International Ocean Drilling Program (IODP) Expedition 405 aimed to understand the physical, chemical, and fluid conditions that produced the 2011 Tohoku Japan earthquake and tsunami and to investigate whether any conditions have changed during the past decade that may indicate the system is preparing for the next event. Two sites were investigated during the expedition: Site C0019, located ~6 km west of the trench, which transected the plate boundary interface and the surrounding rocks and sediment on the upper and lower plates, and Site C0026 on the Pacific plate, ~8 km east of the trench, which was chosen to investigate rock and sediment properties before they enter the plate boundary deformation zone. Geophysical logging data and core samples were successfully collected at both sites, and two temperature observatories were installed across the plate boundary at Site C0019 to monitor fluid conditions. These data provide unprecedented opportunity to investigate processes that lead to large magnitude earthquakes and tsunami, not only in the Japan Trench but in similar tectonic settings worldwide. In addition, these expedition objectives and successes were communicated to a broad audience, including scientists, students, teachers, and the general public, through the efforts of several shipboard outreach officers.