Focussing on Proto-Seismogenic Zone of erosional Convergent Margin.

von Huene, Roland, Ranero, Cesar, Vannucchi, Paola and Saito, Saneatsu (2004) Focussing on Proto-Seismogenic Zone of erosional Convergent Margin. Open Access Eos, Transactions American Geophysical Union, 85 (7). DOI 10.1029/2004EO070003.

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Great earthquakes in subduction zones occur after stable slip in the proto-seismogenic zone transitions to the unstable slip that characterizes seismogenic zones. Subducted material input to seismogenic zones affects this transition. Material structure, lithology and physical properties change progressively during subduction, and according to current hypotheses, specific material transformations trigger the stable to unstable slip transition.Where accretion dominates a convergent margin, material input is trench sediment that is easily drill-sampled.

However, where erosion dominates a margin, material input is unknown because it originates along the base of the upper plate and alters differently. The depth at which material is eroded lies beyond the sampling capabilities of past scientific ocean drilling, so the protoseismogenic zone transformed material has never been drill-sampled; nor does geophysics resolve its structure, lithology, and physical properties. The Japanese riser drill ship Chikyu in the Integrated Ocean Drilling Program (IODP) overcomes this difficulty. Preparing a site for deep drilling is a much greater task than preparing the shallower sites of past programs, so this is accomplished during workshops.

Document Type: Article
Research affiliation: OceanRep > SFB 574 > A1
OceanRep > Geomar Research Center for Marine Geosciences
OceanRep > SFB 574
Refereed: No
Open Access Journal?: No
DOI etc.: 10.1029/2004EO070003
ISSN: 0096-3941
Projects: SFB574
Contribution Number:
SFB 57456
Date Deposited: 07 Apr 2010 11:51
Last Modified: 14 Feb 2017 14:32

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