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Bulletin of the Seismological Society of America; June 1989; v. 79; no. 3; p. 631-644
© 1989 Seismological Society of America
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Effects of sedimentary layers on surface-wave propagation

HIROAKI YAMANAKA, KAZUOH SEO and TAKANORI SAMANO

THE GRADUATE SCHOOL AT NAGATSUTA TOKYO INSTITUTE OF TECHNOLOGY, NAGATSUTA 4259, MIDORI-KU, YOKOHAMA, 227, Japan

Abstract

Earthquake ground motions in the period range from 3 to 10 sec observed in the Kanto plain, Japan, during the western Nagano earthquake of 1984 were predominantly trapped within sedimentary layers. The dispersion observed in the transverse component on sedimentary rock is similar to the dispersion calculated for the fundamental Love wave in a 1-D velocity model derived from the results of the seismic surveys. Forward modeling with a 2-D finite-difference method shows good agreement with observed seismograms when realistic 2-D underground structures derived from seismic surveys are used.




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