Seismic Wave Propagation and Scattering in the Heterogenous Earth, Second Edition




Preface to the Second Edition

Scattering due to randomly distributed small-scale heterogeneities in the earth

significantly changes seismic waveforms of local earthquakes especially for short

periods. Scattering excites long lasting coda waves after the direct arrival and

broadens the apparent duration of oscillation with increasing travel distance much

longer than the source duration time. Models of propagation through deterministic

structures such as those with horizontally uniform velocity layers cannot explain

those observed phenomena. Our goal in writing this book is to put a focus on the

phenomena of seismic wave scattering by distributed heterogeneities in the earth,

especially in the lithosphere, where stochastic treatment is essential to describe both

heterogeneous media and wave propagation through them. Stochastic approaches

and deterministic approaches are complementary for the construction of a unified

image of the earth’s structure.


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