We have just compiled the progress report of the TG for 2003-2006. It is a compilation of reports of members and active extended members of the task group as a state of the art summary for developments of studies on seismic wave propagation through earth medium heterogeneity since IUGG 2003 in Sapporo, Japan. You can download a file entitled "IASPEITGProgRep2006.pdf".

Francisco J. Sanchez-Sesma reported to deal with the Green function retrieval from correlations in the elastic 2D and 3D cases. Ayse Kasiliar, S. Shapiro, S. Buske and Yu. A. Kravtsov reported inverse scattering of surface waves and the analysis of travel time fluctuations in random media by using geometrical optics method. Kawahara reported envelope synthesis of SH waves in a crack distributed 2D medium based on numerical simulation. Michael Korn, Jens Pszbilla and Ulrich Wegler reported the envelope synthesis of vector waves in random media based on the radiative transfer theory with the Born approximation. Ulrich Wegler reported diffusion of wave energy in layered scattering media. Haruo Sato and Michael Korn reported the envelope synthesis of vector waves in random elastic media based on the Markov approximation for the parabolic equation. Tatsuhiko Saito reported the envelope synthesis of scalar waves in nonisotropic random media. Tobias Müller and Serge A. Shapiro reported scattering characteristics of seismic primary wave fields in 2-D and 3-D random media. Tobias Müller and Boris Gurevich reported attenuation and dispersion of seismic waves due to wave-induced flow in random poroelastic media. Osamu Nishimura and Genshiro Kitagawa reported phase fluctuation in random media revealed by laboratory rock experiments by using laser Doppler vibrometers.

Hisashi Nakahara reported envelope inversion studies for high-frequency seismic energy radiation from earthquake faults. Separation of attenuation into intrinsic and scattering loss characteristics was reported by Niren Biswas in Alaska and by Edoardo Del Pezzo at volcanoes in Italy, by Aranza Ugalde in western India. Kazuo Yoshimoto reported spatial distribution of S-coda-wave energy and seismic attenuation structure in Japan. Tsutomu Takahashi reported the path dependence of broadening of S-wave envelopes in Honshu, Japan. He found strong heterogeneity beneath Quaternary volcanoes and transparency between them. Satoshi Matsuoto developed a new method for inverting the array seismic data for the spatial distribution of S-wave scattering coefficient. Aranza Ugalde, E. Carcolé and J. N. Tripathi reported coda envelope inversion for imaging the distribution of scatterers in the crust in southern India. Yoshio Murai reported the determination of a scatterer location by using an ocean bottom seismograph and controlled sources. Masatoshi Miyazawa detected triggering effect of earthquakes caused by a passage of seismic waves. Ulrich Wegler reported temporal change in velocity in volcanoes based on the coda interferometry.

Won Sang Lee measured scattering coefficient in the mantle from the coda envelope analysis before and after ScS arrivals. Won Sang Lee found that a power law decay is more appropriate for explaining coda envelope decay for period from 1-10s in a long lapse time window. Takuto Maeda reported the dominance of higher modes for a period band of 100-200 sec at long lapse time as 20 hours from the origin time.

Haruo SATO
Chair of the Task Group

(June 30, 2006)

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