After every major earthquake, the Earth rings like a bell for
several days. These free oscillations of the Earth and the related
propagating body and surface waves are routinely detected at
broad-band seismographic stations around the world. In this book,
F. A. Dahlen and Jeroen Tromp present an advanced theoretical
treatment of global seismology, describing the normal-mode,
body-wave, and surface-wave methods employed in the determination
of the Earth's three-dimensional internal structure and the source
mechanisms of earthquakes. The authors provide a survey of both the
history of global seismological research and the major theoretical
and observational advances made in the past decade.
The book is divided into three parts. In the first,
"Foundations," Dahlen and Tromp give an extensive introduction to
continuum mechanics and discuss the representation of seismic
sources and the free oscillations of a completely general Earth
model. The resulting theory should provide the basis for future
scientific discussions of the elastic-gravitational deformation of
the Earth. The second part, "The Spherical Earth," is devoted to
the free oscillations of a spherically symmetric Earth. In the
third part, "The Aspherical Earth," the authors discuss methods of
dealing with the Earth's three-dimensional heterogeneity. The book
is concerned primarily with the forward problem of global
seismology--detailing how synthetic seismograms and spectra may be
calculated and interpreted.
As a long-needed unification of theories in global seismology,
the book will be important to graduate students and to professional
seismologists, geodynamicists, and geomagnetists, as well as to
astronomers who study the free oscillations of the Sun and other
stars.
General
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