Expedition 372B/375 summary.

Saffer, D. M., Wallace, L. M. , Barnes, P. M., Pecher, I. A., Petronotis, K. E. , LeVay, L. J. , Bell, R. E. , Crundwell, M. P. , Engelmann de Oliveira, C. H., Fagereng, A. , Fulton, P. M., Greve, A. , Harris, R. N., Hashimoto, Y. , Hüpers, A., Ikari, M. J. , Ito, Y. , Kitajima, H. , Kutterolf, Steffen, Lee, H., Li, X., Luo, M., Malie, P. R., Meneghini, F. , Morgan, J. K. , Noda, A. , Rabinowitz, H. S. , Savage, H. M. , Shepherd, C. L. , Shreedharan, S. , Solomon, E. A., Underwood, M. B. , Wang, M. , Woodhouse, A. D., Bourlange, S. M., Brunet, M. M. Y., Cardona, S., Clennell, M. B., Cook, A. E., Dugan, B. , Elger, Judith , Gamboa, D., Georgiopoulou, A., Han, S., Heeschen, K. U., Hu, G., Kim, G. Y., Koge, H., Machado, K. S., McNamara, D. D., Moore, G. F. , Mountjoy, J. J., Nole, M. A. , Owari, S., Paganoni, M., Rose, P. S., Screaton, E. J. , Shankar, U., Torres, M. E. , Wang, X. and Wu, H.-Y. (2019) Expedition 372B/375 summary. Open Access Proceedings of the International Ocean Discovery Program, 372B/375 . pp. 1-35. DOI 10.14379/iodp.proc.372B375.101.2019.

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Supplementary data:

Abstract

Slow slip events (SSEs) at the northern Hikurangi subduction margin, New Zealand, are among the best-documented shallow SSEs on Earth. International Ocean Discovery Program Expeditions 372 and 375 were undertaken to investigate the processes and in situ conditions that underlie subduction zone SSEs at the northern Hikurangi Trough. We accomplished this goal by (1) coring and geophysical logging at four sites, including penetration of an active thrust fault (the Pāpaku fault) near the deformation front, the upper plate above the SSE source region, and the incoming sedimentary succession in the Hikurangi Trough and atop the Tūranganui Knoll seamount; and (2) installing borehole observatories in the Pāpaku fault and in the upper plate overlying the slow slip source region. Logging-while-drilling (LWD) data for this project were acquired as part of Expedition 372, and coring, wireline logging, and observatory installations were conducted during Expedition 375.

Northern Hikurangi subduction margin SSEs recur every 1–2 y and thus provide an ideal opportunity to monitor deformation and associated changes in chemical and physical properties throughout the slow slip cycle. In situ measurements and sampling of material from the sedimentary section and oceanic basement of the subducting plate reveal the rock properties, composition, lithology, and structural character of material that is transported downdip into the SSE source region. A recent seafloor geodetic experiment raises the possibility that SSEs at northern Hikurangi may propagate to the trench, indicating that the shallow thrust fault (the Pāpaku fault) targeted during Expeditions 372 and 375 may also lie in the SSE rupture area and host a portion of the slip in these events. Hence, sampling and logging at this location provides insights into the composition, physical properties, and architecture of a shallow fault that may host slow slip.

Expeditions 372 and 375 were designed to address three fundamental scientific objectives:

Characterize the state and composition of the incoming plate and shallow fault near the trench, which comprise the protolith and initial conditions for fault zone rock at greater depth and which may itself host shallow slow slip;
Characterize material properties, thermal regime, and stress conditions in the upper plate directly above the SSE source region; and
Install observatories in the Pāpaku fault near the deformation front and in the upper plate above the SSE source to measure temporal variations in deformation, temperature, and fluid flow. The observatories will monitor volumetric strain (via pore pressure as a proxy) and the evolution of physical, hydrological, and chemical properties throughout the SSE cycle.

Together, the coring, logging, and observatory data will test a suite of hypotheses about the fundamental mechanics and behavior of SSEs and their relationship to great earthquakes along the subduction interface.

Document Type: Article
Keywords: International Ocean Discovery Program, IODP, JOIDES Resolution, Expedition 372, Expedition 375, Site U1518, Site U1519, Site U1520, Site U1526, Hikurangi margin, slow slip events, observatories, subduction
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: No
Open Access Journal?: Yes
DOI etc.: 10.14379/iodp.proc.372B375.101.2019
ISSN: 2377-3189
Projects: IODP
Date Deposited: 14 May 2019 11:45
Last Modified: 14 May 2019 11:45
URI: http://oceanrep.geomar.de/id/eprint/46716

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