TY - JOUR
T1 - Slow slip source characterized by lithological and geometric heterogeneity
AU - Barnes, Philip M.
AU - Wallace, Laura M.
AU - Saffer, Demian M.
AU - Bell, Rebecca E.
AU - Underwood, Michael B.
AU - Fagereng, Ake
AU - Meneghini, Francesca
AU - Savage, Heather M.
AU - Rabinowitz, Hannah S.
AU - Morgan, Julia K.
AU - Kitajima, Hiroko
AU - Kutterolf, Steffen
AU - Hashimoto, Yoshitaka
AU - Engelmann De Oliveira, Christie H.
AU - Noda, Atsushi
AU - Crundwell, Martin P.
AU - Shepherd, Claire L.
AU - Woodhouse, Adam D.
AU - Harris, Robert N.
AU - Wang, Maomao
AU - Henrys, Stuart
AU - Barker, Daniel H.N.
AU - Petronotis, Katerina E.
AU - Bourlange, Sylvain M.
AU - Clennell, Michael B.
AU - Cook, Ann E.
AU - Dugan, Brandon E.
AU - Elger, Judith
AU - Fulton, Patrick M.
AU - Gamboa, Davide
AU - Greve, Annika
AU - Han, Shuoshuo
AU - Hüpers, Andre
AU - Ikari, Matt J.
AU - Ito, Yoshihiro
AU - Kim, Gil Young
AU - Koge, Hiroaki
AU - Lee, Hikweon
AU - Li, Xuesen
AU - Luo, Min
AU - Malie, Pierre R.
AU - Moore, Gregory F.
AU - Mountjoy, Joshu J.
AU - McNamara, David D.
AU - Paganoni, Matteo
AU - Screaton, Elizabeth J.
AU - Shankar, Uma
AU - Shreedharan, Srisharan
AU - Solomon, Evan A.
AU - Wang, Xiujuan
AU - Wu, Hung Yu
AU - Pecher, Ingo A.
AU - LeVay, Leah J.
N1 - Funding Information:
P.M.B., L.M.W., S.He., and D.H.N.B. acknowledge support from the Endeavour fund, administered by New Zealand’s Ministry for Business, Innovation, and Employment Contract CO5X1605, as well as NIWA SSIF core funding. R.E.B. received funding from NERC IODP Moratorium Grant NE/S00291X/1. A.F. received funding from NERC IODP Moratorium Grant NE/S002731/1 and ERC Starting Grant 715836 “MICA.” S.K. acknowledges funding from the German Research Foundation (grant KU2685/11-1). C.H.E.d.O. thanks CAPES/IODP Fellowship (88881.131465/2016-01). A.D.W. was supported by IODP UK grant NE/S008853/1. K.E.P. and L.J.L. received funding from the IODP JRSO (NSF grant 1326927). All other U.S. authors were supported by the U.S. Science Support Program. D.G. thanks the Sêr Cymru NRN-LCEE and NERC UKIODP grant NE/R016992/1 for funding and travel support. A.G. was supported by KETEP MOTIE (no. 20168510030830). A.H. received funding from Deutsche Forschungsgemeinschaft Grant HU-1789/5-1. G.Y.K. and H.L. thank K-IODP for support. X.L. was supported by IODP-China, 20180305, Tongji University. F.M. thanks IODP Italia-ECORD. D.D.M. and A.Ge. thank the Geological Survey Ireland. K.U.H. thanks IODP Germany. X.W. was supported by National Natural Science Foundation of China (41976077). M.B.C., P.M.B., L.M.W., M.P.C., and C.L.S. were supported by the Australia/NZ IODP Consortium (ANZIC).
Publisher Copyright:
© 2020 Wondergem et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
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U2 - 10.1126/sciadv.aay3314
DO - 10.1126/sciadv.aay3314
M3 - Article
C2 - 32232148
AN - SCOPUS:85082483078
SN - 2375-2548
VL - 6
JO - Science advances
JF - Science advances
IS - 13
M1 - eaay3314
ER -