Advances in Studies of Heterogeneities in the Earth's Lithosphere: The Keiiti Aki Volume IIYehuda Ben-Zion, William H. K. Lee heterogeneous structures, especially when the data quality is not very high. GAUTIER et al. perform tomographic inversion of local earthquake arrival times for crustal structure and earthquake locations in the actively rifting Gulf of Corinth. The velocities image the rift basin and the hypocenters image a regional-scale detachment fault. Inthe third group of papers, SNIEDER reviews theoretical concepts governing changes of coda waves due to small localized perturbations in the medium properties or source location, and describes how to estimatethe resulting meanand varianceofthe travel-time perturbations. CAMPILLO reviews theoretical results on properties of coda waves in asymptotic multiple-scattering regime, and how to construct Green functions from coda waves and ambient seismic noise. The results are illustrated with applications of imaging velocity structures in Alaska and California. WEGLER et al. use the theory of radiative transfer to model the transport of seismic energy in 2-D and 3-D acoustic random media. The theory accounts correctly for the direct wave front, envelope broadening caused by multiple forward scattering, and late coda caused by multiple wide-angle scattering. However, for very heterogeneous media the radiative transfer results di?er from those of the full wave equation. ZENG develops a set of scattered wave energy equations that include scattered surface waves and conversions of body waves to surface wave scattering. Numerical results show that scattered wave energy can be approximated well by body-wave scattering at earlier times and short distances, but at large distances scattered surface waves dominate the scattered body waves at surface stations. |
Contents
Introduction | 259 |
Geological Observations of Damage Asymmetry in the Structure of the | 301 |
The Applicability of Modern Methods of Earthquake Location | 351 |
Copyright | |
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Common terms and phrases
aftershocks algorithm analysis arrival attenuation BEN-ZION body waves Born scattering coefficients Bull California CAMPILLO co-seismic coda waves computed cross correlation damage data set DD tomography density diffusion distance distribution double-difference tomography Düzce main shock elastic envelopes equation estimated event locations fault core fault plane fault zone Figure fractures frequency Geophys Geophysics Green's function grid Gulf of Corinth heterogeneous hypocenter indicates inversion isotropic scattering İzmit Keiiti Aki km depth km/s Markov approximation mean free path medium method mode noise numerical observed P-wave parameters phase picking-differences propagation Punchbowl fault radiative transfer radiative transfer theory Rayleigh waves relocation rocks San Andreas fault SAN DIEGO SATO scale scattered wave scattering coefficients seismic velocity seismic waves seismograms Seismol seismology shear shows simulations slip SNIEDER solutions source region stations strike-slip surface waves temporal changes THURBER travel-time perturbation values velocity model velocity structure WALDHAUSER waveform ZHANG