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Browse MARGINS Awards in reverse chronological order after start date (most recent first):

Collaborative Research: Frictional and Mineralogical Properties of Sediments Entering Subduction Zones: Controls on Stress State and Earthquakes

MARGINS Focus Area Seismogenic Zone
NSF Org OCE
Latest Amendment Date April 1, 2002
Award Number 0203799
Award Instrument Standard Grant
Program Manager Richard Poore
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES
Start Date May 1, 2002
Expires April 30, 2004 (Estimated)
Expected Total Amount $150,456 (Estimated)
Investigator Kevin M. Brown (Principal Investigator current)
Sponsor U of Cal SD Scripps Inst
9500 Gilman Drive
La Jolla, CA 92093
NSF Program 1620 MARINE GEOLOGY AND GEOPHYSICS
Field Application 0204000 Oceanography
Abstract This study will provide laboratory measurements of the coefficient of friction of natural sediments entering the subduction systems of Nankai, and Costa Rica. The frictional studies will be conducted in a combination of ring shear and direct shear experiments at effective confined stresses between 0.1-50 Mpa. Samples will be characterized by X-ray diffraction (for bulk and clay mineralogy) grain-size, SEM/EDS geochemistry, and wet chemistry (for biogenic silica content). The mechanical properties will be compared with the clay mineralogy to determine the effect of clay minerals on the coefficient of friction. The study will assess the role of the smectite to illite transition and opal to quartz reactions on controlling the up-dip limit of seismogenic activity in subduction zones.