HR: 0800h
AN: NS31B-0402    [Abstracts]
TI: Comparison of Acoustic Full Waveform Tomography in the Time and Frequency Domain
AU: * Kurzmann, A
EM: andre.kurzmann@geophysik.tu-freiberg.de
AF: TU Bergakademie Freiberg, Institute of Geophysics, Gustav Zeuner Strasse 12, Freiberg, 09599, Germany
AU: Koehn, D
EM: koehn@mailserver.tu-freiberg.de
AF: TU Bergakademie Freiberg, Institute of Geophysics, Gustav Zeuner Strasse 12, Freiberg, 09599, Germany
AU: Bohlen, T
EM: tbohlen@geophysik.tu-freiberg.de
AF: TU Bergakademie Freiberg, Institute of Geophysics, Gustav Zeuner Strasse 12, Freiberg, 09599, Germany
AB: For better parameter estimation, both in active source and earthquakes seismology, we need to exploit the richness of full seismic waveforms. Full waveform tomography (FWT) is a powerful method to reach this goal. Although first implementations in the 1980's were conducted in the time-domain (Tarantola (1984)), the frequency domain version of FWT developed in the 1990s by G. Pratt and co- workers (Pratt (1999)) has now emerged as an efficient imaging tool. The main advantage of the frequency-domain approach is the possibility of starting the inversion at low frequencies (large scale structures) and then moving to higher frequency compounds (smaller scale structures), thereby realizing a multi-scale approach. The main advantage of the time-domain method is the efficient parallelisation by domain decomposition leading to a significant speedup on parallel computers (Bohlen (2002)). In this paper we present a new approach that combines both features (frequency selection and parallel computing) by applying iterative wavelength filtering in the time-domain FWT. We compare the results of the new multi-scale time-domain and frequency domain methods using a cross-hole configuration. {References} BOHLEN, T. 2002 Parallel 3-d viscoelastic finite-difference seismic modelling. \textsl{Computers and Geosciences}, {28}, 887-899. PRATT, R. 1999 Seismic waveform inversion in the frequency domain, part 1: Theory and verification in a physical scale model. \textsl{Geophysics} {64}, 888-901. TARANTOLA, A. 1984 Inversion of seismic reflection data in the acoustic approximation. \textsl{Geophysics} {49}, 1259-1266.
DE: 0560 Numerical solutions (4255)
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting