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Slow slip source characterized by lithological and geometric heterogeneity

Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., LeVay, Leah J. and IODP Expedition, 2020. Slow slip source characterized by lithological and geometric heterogeneity. Science Advances 6 (13) , eaay3314. 10.1126/sciadv.aay3314

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Abstract

Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Earth and Ocean Sciences
Additional Information: This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial licence IODP Expedition, 372 Scientists: International Ocean Discovery Program, Expedition 372, Creeping Gas Hydrate Slides and Hikurangi LWD, 26 November 2017 to 4 January 2018; see the Supplementary Materials for a list of participants.
Publisher: American Association for the Advancement of Science
ISSN: 2375-2548
Date of First Compliant Deposit: 27 March 2020
Date of Acceptance: 2 January 2020
Last Modified: 06 Oct 2020 01:28
URI: http://orca-mwe.cf.ac.uk/id/eprint/130611

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