Deep sea in situ excess pore pressure and sediment deformation off NW Sumatra and its relation with the December 26, 2004 Great Sumatra-Andaman Earthquake

The swath bathymetric data acquired during the “Sumatra Aftershocks” cruise from the Sunda trench in the Indian Ocean to the north of the Sumatra Island imaged several scars and deposits. In situ pore pressure measurements using the Ifremer piezometer and coring demonstrate that high excess pore pre...

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Bibliographic Details
Published in:International journal of earth sciences : Geologische Rundschau 2009-06, Vol.98 (4), p.823-837
Main Authors: Sultan, Nabil, Cattaneo, Antonio, Sibuet, Jean-Claude, Schneider, Jean-Luc
Format: Article
Language:English
Subjects:
Bathymetry
Deep sea
Deformation
Earth and Environmental Science
Earth Sciences
Earthquakes
Geochemistry
Geology
Geophysics/Geodesy
Marine
Mineral Resources
Original Paper
Physical oceanography
Pore pressure
Sedimentology
Sediments
Seismic activity
Seismology
Structural Geology
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Summary:The swath bathymetric data acquired during the “Sumatra Aftershocks” cruise from the Sunda trench in the Indian Ocean to the north of the Sumatra Island imaged several scars and deposits. In situ pore pressure measurements using the Ifremer piezometer and coring demonstrate that high excess pore pressure and sediment deformation was generated by a recent event in the scar of the slope failure zone identified by J.T. Henstock and co-authors. This excess pore pressure is localized in the upper sedimentary layers and is not related to an interplate subduction process. Numerical simulations of the hydrological system that take into account the hydro-mechanical properties of the upper sediment layer show that the excess pore pressure and sediment deformations could be generated at the time of the December 26, 2004 Great Sumatra Earthquake.
ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-008-0334-z