HR: 0830h
AN: S31E-0821    [PDF]
TI: Finite Difference Calculations of Banana-Doughnuts
AU: * Crosswhite, J A
EM: jason@newberry.uoregon.edu
AF: University of Oregon, 1272 University of Oregon, Eugene, OR 97403-1272 United States
AU: Humphreys, E
EM: gene@newberry.uoregon.edu
AF: University of Oregon, 1272 University of Oregon, Eugene, OR 97403-1272 United States
AB: The development of banana-doughnut sensitivity kernels (Dahlen et al., 2000) promises improvement in tomographic imaging. However, the theory used to calculate them is not valid near the source or receiver, making them of limited use in regional tomography. We have developed sensitivity kernels that are valid in these areas using finite difference full wavefield calculations. Preliminary 2-D results confirm the results of Dahlen et al. to within several wavelengths, i.e., to within 30 km for a 0.5 Hz wave. For a 0.5 Hz plane wave, the kerenel has a total width of approximately 100 km at a depth of 200 km, illustrating their importance. Three-dimensional computations are underway.
DE: 7218 Lithosphere and upper mantle
DE: 7260 Theory and modeling
SC: Seismology [S]
MN: 2003 Fall Meeting