HR: 16:00h
AN: S32E-01    [PDF]
TI: Resolution Limit of Traveltime Tomography
AU: * Dahlen, F A
EM: fad@princeton.edu
AF: Department of Geosciences, Princeton University, Princeton, NJ 08544 United States
AB: We derive an explicit formula relating a recovered 3-D seismic slowness image to the actual seismic slowness, under the assumption that a tomographically complete collection of finite-frequency traveltime shifts is inverted using linearized ray theory. The tomographically recovered image is blunted, or diminished in amplitude, and blurred, or spread laterally, as a result of wavefront healing and other finite-frequency diffraction effects. The $\mbox{1-D spreading}\sim(\mbox{amplitude reduction})^{-1/3}$, so that total volume-integrated slowness is conserved.
DE: 7200 SEISMOLOGY
DE: 7260 Theory and modeling
SC: Seismology [S]
MN: 2003 Fall Meeting