| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIFORNIA
Abstract
Surface-wave dispersion computations for perfectly-elastic media are generalized to allow dispersion-attenuation computations for anelastic media. In each layer, frequency-dependent, body-wave phase velocity and attenuation are taken into account directly. For a 50-layer structure, a single Love-wave dispersion-attenuation point can be determined in 0.28 sec—the phase velocity containing about 16 significant figures and the phase attenuation about 14, where 16 decimal digits are used in computations on an IBM 360/91 computer. Accuracies of 7 significant figures can be obtained in 0.13 sec. To this latter accuracy, the determination of the Love-wave dispersion and attentuation for an anelastic structure takes about 6.8 times the amount of computation time required to compute the dispersion for the comparable perfectly-elastic structure.
The technique is applied to Love waves on an anelastic, radially heterogeneous sphere. A family of low-velocity zone channel waves is identified and investigated. A possible explanation for the disappearance of Lg across large oceanic paths is offered.
This article has been cited by other articles:
|
|
 |
|
  Rayleigh Waves Generated by Mining Explosions and Upper Crustal Structure around the Powder River Basin, Wyoming Bulletin of the Seismological Society of America, August 1, 2004; 94(4): 1410 - 1429.
|
|
|
|
|
|
Solution of the Rayleigh Eigenproblem in Viscoelastic Media Bulletin of the Seismological Society of America, August 1, 2002; 92(6): 2297 - 2309.
|
|
|
|
|
|
V. F. CORMIER, B. MANDAL, and D. HARVEY Incorporation of velocity gradients in the synthesis of complete seismograms by the locked mode method Bulletin of the Seismological Society of America, June 1, 1991; 81(3): 897 - 930. [Abstract] [PDF]
|
|
|
|
|
|
F. SCHWAB, K. NAKANISHI, M. CUSCITO, G. F. PANZA, G. LIANG, and J. FREZ Surface-wave computations and the synthesis of theoretical seismograms at high frequencies Bulletin of the Seismological Society of America, October 1, 1984; 74(5): 1555 - 1578. [Abstract] [PDF]
|
|
|
|
|
|
F. SCHWAB, J. FREZ, G. F. PANZA, A. H. LIAO, and E. G. KAUSEL Surface-wave dispersion computations: Rayleigh waves on a spherical, gravitating earth Bulletin of the Seismological Society of America, June 1, 1981; 71(3): 613 - 654. [Abstract] [PDF]
|
|
|
|
|
|
W. B. LEE and S. C. SOLOMON Simultaneous inversion of surface-wave phase velocity and attenuation: Rayleigh and Love waves over continental and oceanic paths Bulletin of the Seismological Society of America, February 1, 1979; 69(1): 65 - 95. [Abstract] [PDF]
|
|
|
|
|
|
A. H. LIAO, F. SCHWAB, and E. MANTOVANI Computation of complete theoretical seismograms for torsional waves Bulletin of the Seismological Society of America, April 1, 1978; 68(2): 317 - 324. [Abstract] [PDF]
|
|
|
|
|
|
C. STEPHENS and B. L. ISACKS Toward an understanding of Sn: Normal modes of love waves in an oceanic structure Bulletin of the Seismological Society of America, February 1, 1977; 67(1): 69 - 78. [Abstract] [PDF]
|
|
|
|
|
|
F. SCHWAB and L. KNOPOFF Love waves and the torsional free modes of a multilayered anelastic sphere Bulletin of the Seismological Society of America, June 1, 1973; 63(3): 1107 - 1117. [Abstract] [PDF]
|
|
|
|
|
|
T.-L. TENG and J. P. TUNG Upper-mantle discontinuity from amplitude data of P'P' and its precursors Bulletin of the Seismological Society of America, April 1, 1973; 63(2): 587 - 597. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
