In-Situ Stress Conditions at the Nankai Trough, Site 808 | Zendy

Kate Moran | Zendy; Warner Brückmann | Zendy; Volker Feeser | Zendy; R. G. Campanella | Zendy

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In-Situ Stress Conditions at the Nankai Trough, Site 808

Author(s) -

Kate Moran,

Warner Brückmann,

Volker Feeser,

R. G. Campanella

Publication year - 1993

Publication title -

proceedings of the ocean drilling program. scientific results

Language(s) - English

Resource type - Book series

ISSN - 0884-5883

DOI - 10.2973/odp.proc.sr.131.129.1993

Subject(s) - geology , décollement , trough (economics) , pore water pressure , principal stress , geotechnical engineering , in situ , consolidation (business) , porosity , shore , structural basin , seismology , petrology , geomorphology , oceanography , tectonics , meteorology , economics , macroeconomics , physics , accounting , business , shear (geology)

Shipboard laboratory index property data, shore-based consolidation tests, and in-situ stress and pore-pressure measurements are used in this study to constrain the stress conditions at ODP Site 808, Nankai Trough. Results of these tests are presented along with additional intepretations of porosity rebound and permeability. The sediment at Site 808 is highly affected by excess fluid pressures throughout the sediment column. Excess fluid pressure is severe below the major fault boundary, the decollement. The in-situ measurement of lateral stresses, which are shallow in the sediment section, confirms that the principal stress direction is rotated from a "normal" basin-type condition where the principal stress direction is vertical.

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