Surface Wave Detection and Measurement Using a One Degree Global Dispersion Grid
SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
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We develop high resolution earth and dispersion models for use in detection and measurement of surface waves. The models consist of approximately 550 distinct crust and upper mantle structures, with surface layering andor ocean depths that vary on a one-degree grid to create a total of 64,800 earth models. Tomographic conversion is performed for the crust and upper mantle models using a data set of approximately 540,000 phase and group velocity dispersion measurements. The starting models for the inversion are a modification of Crust 2.0 over AK135. Surface sediments are defined using the global sediment maps of Laske and Masters and ocean bathymetry is defined using Etopo5. We have implemented a new procedure for surface wave identification, in which data is phase-match filtered, then narrow-band filters are applied to the compressed waveform.
- Seismic Detection and Detectors
- Physical and Dynamic Oceanography