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Seismic Surface Waves in a Laterally Inhomogeneous Earth (Paperback, Softcover reprint of the original 1st ed. 1989)
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Seismic Surface Waves in a Laterally Inhomogeneous Earth (Paperback, Softcover reprint of the original 1st ed. 1989)
Series: Modern Approaches in Geophysics, 9
Expected to ship within 10 - 15 working days
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Surface waves form the longest and strongest portion of a seismic
record excited by explosions and shallow earthquakes. Traversing
areas with diverse geologic structures, they 'absorb' information
on the properties of these areas which is best retlected in
dispersion, the dependence of velocity on frequency. The other prop
erties of these waves - polarization, frequency content,
attenuation, azimuthal variation of the amplitude and phase - arc
also controlled by the medium between the source and the recording
station; some of these are affected by the properties of the source
itself and by the conditions around it. In recent years surface
wave seismology has become an indispensable part of seismological
practice. The maximum amplitude in the surface wave train of
virtually every earthquake or major explosion is being measured and
used by all national and international seismological surveys in the
determination of the most important energy parameter of a seismic
source, namely, the magnitude M, . The relationship between M, and
the body wave magnitude fI1t, is routinely employed in
identification of underground nuclear explosions. Surface waves of
hundreds of earthquakes recorded every year are being analysed to
estimate the seismic moment tensor of earthquake sources, to
determine the periods of free oscillations of the Earth, to
construct regional dispersion curves from which in turn the crustal
and upper mantle structure in various areas is derived, and to
evaluate the dissipative parameters of the mantle material."
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