Tobin Harold J 0000-0002-1447-6873 University of Washington http://www.washington.edu/ https://ror.org/00cvxb145 Hirose Takehiro 0000-0002-5397-3346 Kochi Institute for Core Sample Research (JAMSTEC) http://www.jamstec.go.jp/kochi/e/ https://ror.org/059qg2m13 Japan Agency for Marine-Earth Science and Technology JAMSTEC https://www.jamstec.go.jp/e/ https://ror.org/059qg2m13 Ikari Matt J mikari@marum.de 0000-0002-8164-411X MARUM - Center for Marine Environmental Sciences, University Bremen MARUM http://www.marum.de/ https://ror.org/04ers2y35 Kanagawa Kyuichi Chiba University https://ror.org/01hjzeq58 Kimura Gaku gaku@eps.s.u-tokyo.ac.jp 0000-0002-5049-1069 Tokyo University of Marine Science and Technology http://www.kaiyodai.ac.jp/ https://ror.org/048nxq511 Kinoshita Masataka masa@jamstec.go.jp 0000-0003-1144-3651 Earthquake Research Institute, University of Tokyo https://ror.org/057zh3y96 Kitajima Hiroko 0000-0002-1985-284X Texas A&M University TAMU http://www.tamu.edu/ https://ror.org/01f5ytq51 Saffer Demian M 0000-0003-3681-0040 Department of Geosciences, Pennsylvania State University PennState http://www.geosc.psu.edu/ https://ror.org/04p491231 Yamaguchi Asuka asuka@aori.u-tokyo.ac.jp 0000-0003-0974-6530 University of Texas at Austin https://www.utexas.edu/ https://ror.org/00hj54h04 Eguchi Nobuhisa 0009-0004-7728-2875 Institute for Marine-Earth Exploration and Engineering MarE3 Japan Agency for Marine-Earth Science and Technology JAMSTEC https://www.jamstec.go.jp/e/ https://ror.org/059qg2m13 Maeda Lena maedal@jamstec.go.jp Institute for Marine-Earth Exploration and Engineering MarE3 Japan Agency for Marine-Earth Science and Technology JAMSTEC https://www.jamstec.go.jp/e/ https://ror.org/059qg2m13 Toczko Sean 0000-0002-0906-8592 Institute for Marine-Earth Exploration and Engineering MarE3 Japan Agency for Marine-Earth Science and Technology JAMSTEC https://www.jamstec.go.jp/e/ https://ror.org/059qg2m13 IODP Expedition 358 Scientists 2026 Core summary for IODP Hole 358-C0024C dataset https://doi.pangaea.de/10.1594/PANGAEA.997363 2026-10-08T12:23:33 International Ocean Discovery Program (IODP) Expedition 358 was carried out from October 2018 through March 2019 on the D/V Chikyu in an attempt to reach a plate boundary fault zone at seismogenic depths for the first time in scientific ocean drilling. The goal was to extend Hole C0002P from ~2900 to ~5200 meters below seafloor (mbsf) and cross the seismically interpreted main décollement fault zone with logging while drilling, downhole stress measurements, cuttings sampling, mud gas sampling, and partial coring by drilling a sidetrack to create a new hole (C0002Q). Although drilling reached 3262.5 mbsf, the deepest to date in all of scientific ocean drilling, the effort to drill to and sample the target—the megathrust fault zone—was not successful. Operational challenges in establishing sidetrack holes and advancing them at reasonable rates of penetration limited the new cased hole interval to less than 60 m total at a depth shallower than the previously established casing depth of 2922 mbsf. Combined, the cuttings, logs, and ~60 cm of recovered core from sidetrack Holes C0002Q–C0002T revealed hemipelagic sediments and fine silty turbidites consistent in lithology and physical properties with those recovered in the same depth interval at the same site during Integrated Ocean Drilling Program Expedition 348. Cuttings revealed evidence of only weakly deformed rock, with relatively common calcite veins but few other structural indicators. Because no downhole leak-off tests were made and very little borehole imaging was performed, no further insight into the tectonic context was acquired. After riser drilling at Site C0002 was terminated, drilling at alternate contingency Sites C0024 and C0025 was carried out. Site C0024 targeted the frontal thrust region to sample and log hanging wall rocks and the shallow portion of the décollement zone, and Site C0025 accessed sediments in the Kumano fore-arc basin. At Site C0024, a dedicated logging hole was drilled and a very complete suite of logs were acquired from 0 to 869 mbsf. Preliminary interpretation of log response and images suggests the frontal thrust zone was encountered from about 813 mbsf to the base of the hole, with a zone of notably low resistivity and steep bedding from 850 mbsf to the bottom of the hole. Core samples revealed lithologic units interpreted to be hemipelagic and turbiditic basin fill, trench fill, and Shikoku Basin sediments and encountered deformation potentially associated with a back thrust imaged in seismic reflection data. However, coring had to be terminated at about 620 mbsf, well short of the frontal thrust zone. Site C0025 recovered fore-arc basin sediments underlain by those interpreted to have been deposited in a trench-slope basin setting; no clear transition into older, inner accretionary wedge material was identified during the preliminary analysis. Coring from 400 to 571 mbsf yielded datable material and possible evidence for diapiric intrusion of sediments. Tobin Harold J 0000-0002-1447-6873 Hirose Takehiro 0000-0002-5397-3346 Ikari Matt J mikari@marum.de 0000-0002-8164-411X Kanagawa Kyuichi Kimura Gaku gaku@eps.s.u-tokyo.ac.jp 0000-0002-5049-1069 Kinoshita Masataka masa@jamstec.go.jp 0000-0003-1144-3651 Kitajima Hiroko 0000-0002-1985-284X Saffer Demian M 0000-0003-3681-0040 Yamaguchi Asuka asuka@aori.u-tokyo.ac.jp 0000-0003-0974-6530 Eguchi Nobuhisa 0009-0004-7728-2875 Maeda Lena maedal@jamstec.go.jp Toczko Sean 0000-0002-0906-8592 IODP Expedition 358 Scientists 2020 Volume 358: NanTroSEIZE Plate Boundary Deep Riser 4: Nankai Seismogenic/Slow Slip Megathrust book Proceedings of the International Ocean Discovery Program, International Ocean Discovery Program 358 https://doi.org/10.14379/iodp.proc.358.2020 Hirose Takehiro 0000-0002-5397-3346 Ikari Matt J mikari@marum.de 0000-0002-8164-411X Kanagawa Kyuichi Kimura Gaku gaku@eps.s.u-tokyo.ac.jp 0000-0002-5049-1069 Kinoshita Masataka masa@jamstec.go.jp 0000-0003-1144-3651 Kitajima Hiroko 0000-0002-1985-284X Saffer Demian M 0000-0003-3681-0040 Tobin Harold J 0000-0002-1447-6873 Yamaguchi Asuka asuka@aori.u-tokyo.ac.jp 0000-0003-0974-6530 Eguchi Nobuhisa 0009-0004-7728-2875 Maeda Lena maedal@jamstec.go.jp Toczko Sean 0000-0002-0906-8592 Bedford John Chiyonobu Shun Colson Tobias August Conin Marianne marianne.conin@univ-lorraine.fr 0000-0002-6072-3919 Cornard Pauline cornard@uni-bremen.de 0000-0002-5034-937X Dielforder Armin Doan Mai-Linh Dutilleul Jade Faulkner Daniel Roy Fukuchi Rina 0000-0001-9953-2047 Guérin Gilles Hamada Yohei 0000-0001-7196-9271 Hamahashi Mari Hong W L 0000-0002-7247-1827 Ijiri Akira ijiri@maritime.kobe-u.ac.jp 0000-0001-7140-1491 Jaeger Dominik Jeppson Tamara 0000-0001-5526-5530 Jin Zirou John Barbara E bjohn@uwyo.edu Kitamura Manami Kopf Achim J akopf@marum.de http://www.marum.de/Achim_J._Kopf.html Masuda Harue Matsuoka Atsushi Atsushi.Matsuoka@unh.edu 0000-0002-6327-9948 Moore Gregory F 0000-0002-9649-3174 Otsubo Makoto Regalla Christine Sakaguchi Arito 0000-0002-6192-4384 Sample James C Schleicher Anja Maria 0000-0003-4052-8654 Sone Hiroki 0000-0001-5525-1294 Stanislowski Katja k.stanislowski@uni-bremen.de 0000-0003-1999-9486 Strasser Michael michael.strasser@uibk.ac.at 0000-0003-3991-2405 Toki Tomohiro Tsuji Takeshi Ujiie Kohtaro Underwood Michael B Yabe Suguru Yamamoto Yuzuru 0000-0003-2514-3174 Zhang Junli jzhang@marum.de Sanada Yoshinori 0000-0002-4048-4076 Le Ber Erwan erwan.le-ber@umontpellier.fr 0000-0002-8020-2029 Saito Saneatsu 2020 Expedition 358 methods book chapter In: Tobin, H, Hirose, T, Ikari, M, Kanagawa, K, Kimura, G, Kinoshita, M, Kitajima, H, Saffer, D, Yamaguchi, A, Eguchi, N, Maeda, L, Toczko, S, Exedition 358 Scientists, Volume 358: NanTroSEIZE Plate Boundary Deep Riser 4: Nankai Seismogenic/Slow Slip Megathrust, Proceedings of the International Ocean Discovery Program, 358, International Ocean Discovery Program https://doi.org/10.14379/iodp.proc.358.102.2020 136.7899 136.7899 33.0333 33.0333 136.7899 33.0333 2019-03-12T00:00:00 2019-03-12T00:00:00 -3843.5 -3843.5 vertical profile IODP Integrated Ocean Drilling Program / International Ocean Discovery Program https://www.iodp.org/ 358-C0024C 33.0333 136.7899 Kumano Basin -3843.5 2019-03-12T00:00:00 Exp358 NanTroSEIZE Plate Boundary Deep Riser 4 Shimizu, Japan 2018-10-07T00:00:00 Shimizu, Japan 2019-03-31T00:00:00 Chikyu https://en.wikipedia.org/wiki/Chiky%C5%AB JRAJ 9234044 Hirose, Takehiro Ikari, Matt J Kanagawa, Kyuichi https://doi.org/10.14379/iodp.proc.358.2020 Chikyu https://en.wikipedia.org/wiki/Chiky%C5%AB JRAJ 9234044 Core drilling CDRILL 1 137 % (1.37 m) Elevation is given in MSL (below mean sea level), water depth BRT (below rotary table) (m): 3872, top depth BRT (m): 3878 bottom depth BRT (m): 3879, top depth (mbsf): 6, bottom depth (mbsf): 7 11 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Sample code/label Sample label DSDP/ODP/IODP sample designation hdl:10013/epic.27914.d001 Sample label Device type Device Device Date/Time local Date/Time local https://en.wikipedia.org/wiki/ISO_8601 Core on deck (JST (Japan Standard Time)) Date/Time local Date/time end Date/time end http://en.wikipedia.org/wiki/ISO_8601 Core on deck (UTC) Date/time end Depth, water, top/minimum Depth water top m depth http://purl.obolibrary.org/obo/PATO_0001595 water http://purl.obolibrary.org/obo/CHEBI_15377 minimum Length L http://dbpedia.org/resource/Length IODP Depth Scale Terminology hdl:10013/epic.50267.d001 Below rotary table (BRT) Depth water top [m] Depth, water, bottom/maximum Depth water bot m depth http://purl.obolibrary.org/obo/PATO_0001595 water http://purl.obolibrary.org/obo/CHEBI_15377 maximum Length L http://dbpedia.org/resource/Length IODP Depth Scale Terminology hdl:10013/epic.50267.d001 Below rotary table (BRT) Depth water bot [m] Section Top in meters below surface Top mbsf surface http://purl.obolibrary.org/obo/ENVO_00010504 Length L http://dbpedia.org/resource/Length IODP Depth Scale Terminology hdl:10013/epic.50267.d001 Top [mbsf] Section Bot in meters below surface Bot mbsf surface http://purl.obolibrary.org/obo/ENVO_00010504 Length L http://dbpedia.org/resource/Length IODP Depth Scale Terminology hdl:10013/epic.50267.d001 Bot [mbsf] Drilled Drilled m Length L http://dbpedia.org/resource/Length IODP Depth Scale Terminology hdl:10013/epic.50267.d001 Advance Drilled [m] Core length Core length m According to Hirose et al. (2020) https://doi.org/10.14379/iodp.proc.358.102.2020 Recovered Core length [m] Recovery Recovery % Dimensionless Ratio ψ According to Hirose et al. (2020) https://doi.org/10.14379/iodp.proc.358.102.2020 Recovery [%] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels D/V Chikyu Expedition 358 IODP author118995 author119002 author119007 author119009 author119019 author119022 author119044 author119045 author119046 author119047 author119048 author119049 author119050 author119051 author119052 author119053 author119054 author119055 author119237 author20384 author27164 author28798 author29321 author31556 author32053 author32054 author33105 author34912 author35549 author35550 author36007 author36477 author36478 author36485 author36493 author36494 author36497 author37183 author38205 author39581 author39650 author39913 author41943 author42238 author44118 author47181 author50849 author50850 author62630 author65509 author70044 author74254 author75972 author874 author97024 basis626 campaign3373064 campaign47996 curlevel30 event3507787 geocode1599 geocode1600 geocode1601 geocode8128 inst118 inst11999 inst124 inst130 inst20207 inst21083 inst21658 inst22975 inst22988 inst2545 inst277 license21 method10903 method19617 method5059 method9338 param150986 param16045 param16053 param16056 param16057 param508172 param518753 param518754 param519362 param78085 param790 project4048 ref141644 ref141676 term1073131 term1073145 term2606205 term29922 term38492 term41019 term43794 term43863 term492 term75140 term78584 term78589 topotype3