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Effects of surface and subsurface irregularities on the amplitudes of monochromatic waves

Wong, H. L. and Trifunac, M. D. and Westermo, B. (1977) Effects of surface and subsurface irregularities on the amplitudes of monochromatic waves. Bulletin of the Seismological Society of America, 67 (2). pp. 353-368. ISSN 0037-1106.

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Measurements of surface ground motion generated by forced vibration of a nine-story reinforced concrete building at a distance of 2 to 5.5 km are described. Three components of the displacement field were measured at 13 points along a line traversing an elongated canyon underlain by a shallow and dipping alluvial layer. The variations of measured displacement amplitudes have been modeled by (a) a two dimensional surface topographic feature corresponding to the average cross section of the canyon and (b) by a two-dimensional model of an alluvium valley excited by a line source. Comparison of the observed and computed amplitude variations with distance suggests that for the geometry corresponding to this experiment the effect of the dipping layer of alluvium seems to play a considerably more important role than the canyon.

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Additional Information:Copyright © 1977, by the Seismological Society of America. Manuscript received April 28, 1976. We thank J. G. Anderson, M. Dravinski, and J. E. Luco for critical reading of the manuscript and for several useful suggestions. The assistance given by R. Axelrad and A. Egwuatu on the experimental measurements is also appreciated. This research was supported by a contract from the United States Geological Survey, by a grant from the National Science Foundation, and by a contract from the Nuclear Regulatory Commission.
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Nuclear Regulatory Commission (NRC)UNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20140812-144847886
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48437
Deposited By: George Porter
Deposited On:13 Aug 2014 14:45
Last Modified:03 Oct 2019 07:03

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