HR: 08:00h
AN: T11B-01    [PDF]
TI: Correlating the textures of altimetric gravity and multibeam bathymetry
AU: * Smith, W H
EM: Walter.HF.Smith@noaa.gov
AF: NOAA Lab for Satellite Altimetry, NOAA code E/RA-31 1335 East West Hwy., room 5408, Silver Spring, MD 20910-3282 United States
AU: Marks, K M
EM: Karen.Marks@noaa.gov
AF: NOAA Lab for Satellite Altimetry, NOAA code E/RA-31 1335 East West Hwy., room 5408, Silver Spring, MD 20910-3282 United States
AU: Goff, J A
EM: goff@utig.ig.utexas.edu
AF: UT Institute for Geophysics, University of Texas at Austin 4412 Spicewood Springs Rd., Bldg 600, Austin, TX 78759 United States
AU: Sandwell, D T
EM: dsandwell@ucsd.edu
AF: Scripps Institution of Oceanography, Univ of Calif San Diego 9500 Gilman Dr., code 0225, La Jolla, CA 92093-0225 United States
AB: We compare the tectonic fabric textures seen in altimetric gravity and multibeam bathymetry at sites on the flanks of slow- and fast-spreading ridges, mid-plate, and back-arc basin areas. Our aim is to correlate altimetric and bathymetric textures, to determine the limits of resolution of current altimetric data, and to characterize the seafloor texture signals that should be recoverable with a future altimetric mission having a lower noise floor than existing data. Multibeam data we compiled for this analysis are from the RIDGE synthesis, the NGDC coastal and global relief projects and other holdings, and data contributed by other investigators. Altimetric data are gravity version 11.1 (18 km filter) and topography "polish" version 8.2. All our data are available at http://ibis.grdl.noaa.gov/SAT/Bathy.intro.html Areas with dense multibeam swath coverage are necessarily small, and the wavelengths our data sets resolve are mostly in the uncompensated band. Simple forward models of gravity assuming uncompensated seafloor topography agree well with altimetric gravity in amplitude and spectral roll-off, except at the shortest wavelengths where altimetric fields are too smooth. Where abyssal hill amplitudes and wavelengths are large enough, gravity texture shows clear ridge-parallel lineations.
UR: http://ibis.grdl.noaa.gov/SAT/Bathy.intro.html
DE: 0930 Oceanic structures
DE: 0933 Remote sensing
DE: 1219 Local gravity anomalies and crustal structure
DE: 3010 Gravity
DE: 3045 Seafloor morphology and bottom photography
SC: Tectonophysics [T]
MN: 2003 Fall Meeting