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. and LeVay, Leah J. (2020) Slow slip source characterized by lithological and geometric heterogeneity Science Advances, 6 (13). eaay3314. DOI 10.1126/sciadv.aay3314.

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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.

Document Type: Article
Keywords: Geophysics, Lithology, Offshore oil well production
Research affiliation: MARUM
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
DOI etc.: 10.1126/sciadv.aay3314
ISSN: 2375-2548
Date Deposited: 06 Apr 2020 09:20
Last Modified: 06 Apr 2020 09:20

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