Hamada, YoheiHirose, TakehiroIjiri, AkiraYamada, YasuhiroSanada, YoshinoriSaito, SaneatsuSakurai, NoriakiSugihara, TakamitsuYokoyama, TakahiroSaruhashi, TomokazuHoshino, TatsuhikoKamiya, NanaBowden, StephenCramm, MargaretHenkel, SusannHomola, KiraImachi, HiroyukiKaneko, MasanoriLagostina, LorenzoManners, HayleyMcClelland, Harry LukeMetcalfe, KyleOkutsu, NatsumiPan, DonaldRaudsepp, Maija JocelynSauvage, JustineSchubotz, FlorenceSpivack, ArthurTonai, SatoshiTreude, TinaTsang, Man YinViehweger, BernhardWang, David T.Whitaker, EmilyYamamoto, YuzuruYang, KihoKinoshita, MasatakaMaeda, LenaKubo, YusukeMorono, YukiInagaki, FumioHeuer, Verena B.2018-11-262018-11-262018-12-01Hamada, Y, Hirose, T, Ijiri, A, Yamada, Y, Sanada, Y, Saito, S, Sakurai, N, Sugihara, T, Yokoyama, T, Saruhashi, T, Hoshino, T, Kamiya, N, Bowden, S, Cramm, M, Henkel, S, Homola, K, Imachi, H, Kaneko, M, Lagostina, L, Manners, H, McClelland, H L, Metcalfe, K, Okutsu, N, Pan, D, Raudsepp, M J, Sauvage, J, Schubotz, F, Spivack, A, Tonai, S, Treude, T, Tsang, M Y, Viehweger, B, Wang, D T, Whitaker, E, Yamamoto, Y, Yang, K, Kinoshita, M, Maeda, L, Kubo, Y, Morono, Y, Inagaki, F & Heuer, V B 2018, 'In-situ mechanical weakness of subducting sediments beneath a plate boundary décollement in the Nankai Trough', Progress in Earth and Planetary Science, vol. 5, 70. https://doi.org/10.1186/s40645-018-0228-z2197-4284http://hdl.handle.net/2164/11520Acknowledgements This research used data provided by the International Ocean Discovery Program (IODP). This manuscript was improved following discussions with Prof. G Kimura and Dr. Jun Kameda. We are grateful to Dr. W. Tanikawa for his repeated help with the numerical calculations. We also thank M Ikari and one anonymous reviewer for their constructive comments. The authors wish to thank Mantle Quest Japan for operating the vessel and drillings. We received generous supports from Technology Department in CDEX. We gratefully acknowledge the support provided by the operational staff of D/V Chikyu and the onboard laboratory technicians (Marine Works Japan). Funding This study was supported by JSPS KAKENHI grant 16H04064, 15H05717.1935339engDrilling parametersDV ChikyuEquivalent strengthExcess fluid pressureInternational Ocean Discovery Program (IODP)Nankai TroughPlate boundary décollementSite C0023Temperature-Limit of the Deep Biosphere off Muroto (T-Limit)TA Engineering (General). Civil engineering (General)General Earth and Planetary SciencesTAJournal article10.1186/s40645-018-0228-zhttp://www.scopus.com/inward/record.url?scp=85056092551&partnerID=8YFLogxK5