L. Dale Bibee, Naval Research Laboratory, Stennis Space Center, MS 39529-5004, USA
LeRoy M. Dorman, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0215, USA.
ABSTRACT: A technique for inverting marine seismic interface wave data for shear wave attenuation parameters of ocean sediments is presented. Because of the difficulty in estimating spectral ratios of seismograms in the case when multiple modes are present, a linear perturbation technique that uses the recorded time series or its envelope as input data is proposed. The technique is stable for tests using synthetic data. Application of the technique to data collected in the Gulf of Mexico yields a mode producing a good fit to the data. However, a simple source model is insufficient to correctly predict modal excitations, and the source must be parameterized as part of the inversion process.