Advances in Studies of Heterogeneities in the Earth's Lithosphere: The Keiiti Aki
Yehuda Ben-Zion, William H. K. Lee
Springer Basel AG, Apr 19, 2006 - Science - 370 pages
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.
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Geological Observations of Damage Asymmetry in the Structure of the
The Applicability of Modern Methods of Earthquake Location
8 other sections not shown
aftershocks algorithm amplitude analysis arrival attenuation Ben-Zion body waves Born scattering coefficients California Campillo co-seismic coda waves computed cross correlation crustal damage data set DD tomography density diffusion Diizce main shock distance distribution double-difference tomography Duzce elastic envelopes equation estimated event locations fault core fault plane fault zone Figure fractures frequency Geophys Green function grid Gulf of Corinth heterogeneous hypocenter indicates inversion isotropic scattering Keiiti Aki km depth Markov approximation mean free path medium method mode multiple scattering noise numerical observed P-wave phase picking-differences propagation Punchbowl fault radiative transfer radiative transfer theory random Rayleigh waves relocation rocks San Andreas fault Sato scale scattered wave scattering coefficients seismic coda seismic velocity seismic waves seismograms Seismol seismology shear shows simulations slip Snieder solutions source region stations surface waves temporal changes Thurber travel-time perturbation values velocity model velocity structure Waldhauser wave energy Zhang