Accession Number : ADA327451

Title :   Advanced Optical Fiber Communication Systems.

Descriptive Note : Final rept. 1 Sep 91-31 Aug 94,

Corporate Author : STANFORD UNIV CA DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Kazovsky, Leonid G.

PDF Url : ADA327451

Report Date : 31 AUG 1994

Pagination or Media Count : 172

Abstract : This research project is entitled Geomorphology of Headless Submarine Canyons: Prediction of Slope Failure, Sediment Strength and Pore Pressure Gradient, and the Regular Spacing of Submarine Canyons. The Atlantis 11/ALVIN program conducted in September, 1993 was successful in identifying cold seeps, determining their distribution, and measuring pore pressure gradients within and between the cold seeps. We identified four cold seeps; all cold seep sites were within canyons, and none were found along strike between canyons. Even though all fluid seeps were found in canyons, not all canyons had seeps, and the location of the seeps within the canyons differed on the landward and seaward limbs of the anticlines. This suggests both spatial and temporal variations on fluid flow. Our analysis of the geotechnical data we collected suggests that the ambient pore pressure gradients at the seeps in the canyons are above hydrostatic, but below that required to initiate slope failure. If these measurements represent steady-state, than some transient pressure pulse may be required to initiate slope failure. Our modeling suggests that seismicity or methane expulsion can produce the required transient.

Descriptors :   *GEOMORPHOLOGY, *SUBMARINE CANYONS, *SEEPAGE, PRESSURE GRADIENTS, TRANSIENTS, SPATIAL DISTRIBUTION, TIME INTERVALS, MEASUREMENT, PREDICTIONS, INTERACTIONS, FAILURE, PULSES, STRENGTH(GENERAL), SLOPE, FLUIDS, METHANE, PORE PRESSURE, SEDIMENTS, SEISMOLOGY, FLUID FLOW, EXPULSION.

Subject Categories : Physical and Dynamic Oceanography
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE