Nonlinear behavior of soils revealed from records of the 2000 Tottori (Japan) earthquake at stations of the Digital Strong motion Network Kik-Netстатья
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Аннотация:Acceleration records of the Tottori earthquake (6 October 2000), provided
by stations of the Digital Strong-Motion Network Kik-Net, show clear evidence
of the nonlinearity of soil response at sites located in near-fault zones. In this study,
records of the mainshock of the Tottori earthquake are analyzed, and stresses and
strains, induced by the strong motion in the upper 100 or 200 m of soil, are reconstructed
at sites located within 80 km from the fault plane. For reconstructing stresses
and strains, the method is applied, which we developed and used previously for
studying the response of soils during the 1995 Kobe earthquake. Nonlinear timedependent
stress–strain relations in the soil layers are estimated based on verticalarray
records. A good agreement between the observed and simulated accelerograms
of the Tottori earthquake testifies to the validity of the obtained vertical distributions
of stresses and strains in the soil layers. We also evaluated variations of the shear
moduli of the soil layers, caused by the strong motion, at stations located at different
distances from the fault plane. Changes in the rheological properties of the upper
soil layers were found closest to the fault-plane stations. A similarity in stress–strain
relations, describing the behavior of similar soils during the 1995 Kobe earthquake
and the 2000 Tottori earthquake, was obtained, indicating the possibility of precasting
soil behavior in future earthquakes at sites where profiling data are available.