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Published October 1978 | Published
Journal Article Open

Crustal structures inferred from Rayleigh-wave signatures of NTS explosions


An improved method for determining plane-layered earth models that accurately represent the important features controlling the amplitude and wave form of surface waves is presented. The method includes a formal inversion of phase and group velocity data determined from observed seismograms and is applied to the Rayleigh waves from Nevada Test Site (NTS) explosions recorded at Albuquerque, New Mexico and Tucson, Arizona. For both paths the observed dispersion agrees with that from the models with a maximum residual of only 0.01 km/sec. Further, the models are consistent with other available information about these paths (e.g., from refraction surveys). To properly account for local differences in the material at the source, an approximate theory is constructed in which the amplitude excitation is computed in a source structure and the dispersion in a separate path structure. Using this theory and the crustal models from the inversion, synthetic seismograms are computed that match the observed seismograms remarkably well.

Additional Information

© 1978 Seismological Society of America. Manuscript received April 7, 1978. It is a pleasure to acknowledge the assistance of our colleagues at Systems, Science and Software, especially Dr. John Savino, Dr. Joseph Masso, and Mr. David Lambert who did much of the data analysis. Dr. Charles Archambeau designed the MARS program used to determine group velocities. The inversion program used was developed in part while one of the authors (W.L. Rodi} was a student in the Department of Geosciences at The Pennsylvania State University. The authors are grateful to Dr. Brian Mitchell for providing a tabulation of his Western U.S. attenuation data. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the VELA Seismological Center under Contract F08606-76-C-0041 with Systems, Science and Software.

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October 26, 2023