Title :
Anisotropy of bottom loss in marine sediments
Author :
Lindwall, D.A. ; Wood, W.T.
Author_Institution :
Marine Geosci., Naval Res. Lab., Stennis Space Center, MS, USA
Abstract :
We observed anisotropy in the acoustic reflection amplitudes from the seafloor at Hydrate Ridge on the Oregon Margin. We analyzed acoustic data from several OBS receivers and several sound-source lines with one line being perpendicular to the others. We used time windows to isolate the acoustic data that contained the most information regarding the seafloor reflectivity. The bottom loss is directly related to these observed reflection strengths with some restrictions. The observed higher reflection strengths for the east-west line (perpendicular to bathymetrie contours) than to reflection strengths on the north-south lines is unexpected and so far unexplained. We expect that the primary causes of variations in the reflectivity are due to scattering and from heterogeneity.
Keywords :
acoustic wave reflection; bathymetry; oceanographic regions; sediments; Hydrate Ridge; OBS receivers; Oregon Margin; USA; acoustic data; acoustic reflection amplitudes; bathymetric contours; bottom loss anisotropy; marine sediments; seafloor; seafloor reflectivity; sound-source lines; Acoustic noise; Acoustic reflection; Acoustic scattering; Anisotropic magnetoresistance; Data analysis; Geology; Reflectivity; Sea floor; Sea measurements; Sediments;
Conference_Titel :
OCEANS 2009, MTS/IEEE Biloxi - Marine Technology for Our Future: Global and Local Challenges
Conference_Location :
Biloxi, MS
Print_ISBN :
978-1-4244-4960-6
Electronic_ISBN :
978-0-933957-38-1
