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@article{Regalla:2019:10.1029/2019GC008483,
author = {Regalla, C and Bierman, P and Rood, DH},
doi = {10.1029/2019GC008483},
journal = {G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences},
pages = {4956--4971},
title = {Meteoric Be-10 reveals a young, active accretionary prism and structurally complex decollement in the vicinity of the 2011 Tohoku Earthquake rupture},
url = {http://dx.doi.org/10.1029/2019GC008483},
volume = {20},
year = {2019}
}

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TY  - JOUR
AB  - We present new meteoric 10Be concentration data from marine sediment cores recovered during Integrated Ocean Drilling Program Expedition 343 (JFAST) that help constrain the age, origin, and internal structure of the frontal prism at the Japan trench in the vicinity of the 2011 Tohokuoki M9 earthquake rupture. 10Be sediment ages from the lower portion of the frontal prism range from ~0–10 Ma, with >60% of analyzed samples above the décollement yielding young ages <2 Ma. Repetition and inversion of highoverlow 10Beconcentration sediments indicate the presence of stratigraphic inversions that correspond to faulting and imbrication of late Miocene and Quaternary sediments. The density of faults inferred indicates that the frontal prism has a fault spacing on the order of 10 s of meters, and the identification of faults in the underthrust section suggests that the plate boundary décollement may be a zone with multiple slip surfaces. Comparison of 10Be concentrations in the frontal prism with those of the incoming and forearc slope sediments indicates that the majority of the prism is sourced from accretion of Pacific Plate sediments, rather than from reworked frontal prism or slope sediments. These data suggest that over at least the past ~1–2 Ma, the décollement preferentially has localized at or near the base of the incoming sediment section, with relatively efficient sediment accretion occurring even in the presence of subducted horstandgraben topography.
AU  - Regalla,C
AU  - Bierman,P
AU  - Rood,DH
DO  - 10.1029/2019GC008483
EP  - 4971
PY  - 2019///
SN  - 1525-2027
SP  - 4956
TI  - Meteoric Be-10 reveals a young, active accretionary prism and structurally complex decollement in the vicinity of the 2011 Tohoku Earthquake rupture
T2  - G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences
UR  - http://dx.doi.org/10.1029/2019GC008483
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000495511700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GC008483
UR  - http://hdl.handle.net/10044/1/76485
VL  - 20
ER  -

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