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By Barry Saltzman, Renata Dmowska

ISBN-10: 0120188430

ISBN-13: 9780120188437

This sequence offers a venue for longer studies of present advances in geophysics. Written at a degree available to graduate scholars, the articles serve to increase wisdom of assorted fields and should be priceless in classes and seminars.

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Extra resources for Advances in Geophysics, Vol. 43

Example text

The sign in (78) is chosen according to the propagation direction: (+) for transmitted and (-) for reflected waves. xR, O'zxg) (80) 34 PANZA, ROMANELLI, AND VACCARI can be regarded as a superposition of propagating modes of medium II and medium I, respectively. In each horizontal section the displacement, due to a Love mode, can be written as (see Eq. 14) Uy(X, Z, t) -- [As cos(krf3~z) + Bs sin(kr~sz)]e i~ot-kx), (81) where As and Bs are the layer constants and rf3s -- if c > [3s - 1 (82) ros -- -i i r ifc < 13~, where c is the phase velocity and 13s is the S-wave velocity in section s.

1991) to laterally heterogeneous media. In the following figures we show some examples of synthetic seismograms calculated for a laterally heterogeneous structural model that is assembled starting from models C and P, used in Sect. 2 (see Fig. 9). The source-receiver distance is 100 km and the vertical interface between the two media is placed right at the middle of the path. An instantaneous point-source is placed at the depth of 10 km, with a scalar seismic moment of 10 ~3 Nm. The orientation of the double-couple of forces is defined as follows: strike-receiver angle = 60 ~ dip = 90 ~ rake = 180 ~ The cut-off frequency for the computations is 1 Hz.

In Fig. 21, the difference between the signal shown in the last row of the CP-radial component of motion (and, to a minor extent, of the CP-vertical component) and the corresponding signals, obtained summing modes with lower order numbers, is bigger than in the other cases. This can be explained by the fact that, in the P-SV motion problem for the CP case, the intercoupling energy for the higher modes becomes significant, making the amplitude of the early phases, with higher frequency content, comparable to that of the later dominant arrivals associated with lower order modes (see Fig.

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Advances in Geophysics, Vol. 43 by Barry Saltzman, Renata Dmowska


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