Anelastic strain recovery reveals extension across SW Japan subduction zone.

Byrne, T. B., Lin, W., Tsutsumi, A., Yamamoto, Y., Lewis, J. C., Kanagawa, K., Kitamura, Yujin, Yamaguchi, A. and Kimura, G. (2009) Anelastic strain recovery reveals extension across SW Japan subduction zone. Open Access Geophysical Research Letters, 36 . L23310. DOI 10.1029/2009GL040749.

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Sediment dominated convergent margins typically
record substantial horizontal shortening often associated
with great earthquakes. The convergent margin south of
Japan is arguably one of the most extensively investigated
margins and previous studies have documented extensive
evidence for accretion and horizontal shortening. Here, we
show results from anelastic strains recovered from three
partially lithified sediment samples (40~ porosities)
across the southwest Japan accretionary prism and
propose that the margin is dominated by horizontal
extension rather than compression. The anelastic strain
results are also consistent with stress directions interpreted
from two independent techniques - bore hole breakout
orientations and core-scale fault data. We interpret this
unexpected result to reflect geologically recent underthrusting
of a thick sediment package and concomitant
weakening of the decollement.

Document Type: Article
Keywords: stress; subduction; extension; SW Japan subduction zone
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009GL040749
ISSN: 0094-8276
Projects: IODP
Date Deposited: 15 Dec 2009 11:15
Last Modified: 13 Oct 2017 08:26

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