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RELATION OF NONLINEAR DYNAMIC SOIL PROPERTIES OBSERVED IN STRONG MOTION RECORDS AT K-NET AND JMA STATIONS IN OJIYA WITH THOSE OBTAINED FROM LABORATORY TEST

2006; Volume: 71; Issue: 603 Linguagem: Inglês

10.3130/aijs.71.63_1

1881-8153

Kohji Tokimatsu, Toru SEKIGUCHI,

Landslides and related hazards

Strain-dependent shear moduli and damping factors of surface soils at K-NET and JMA stations in Ojiya are estimated not only from cyclic torsional shear tests on undisturbed samples obtained at the sites but also from back-calculation of transfer function of the strong motion records between either of the two sites and a nearby rock outcrop site. Both laboratory test and back-calculation of strong motion records indicate that the near-surface peat at K-NET shows weaker nonlinearity than the near-surface silt at JMA, which might have had strong effects on the observed ground motions including those in the Mid Niigata Prefecture Earthquake in 2004 at the two sites.