Atypical soil behavior during the 2011 Tohoku earthquake (Мw =9)статья

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Дата последнего поиска статьи во внешних источниках: 26 декабря 2017 г.

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[1] Pavlenko O. V. Atypical soil behavior during the 2011 tohoku earthquake (Мw =9) // Journal of Seismology. — 2016. — Т. 20, № 3. — С. 803–826. To understand physical mechanisms of generation of abnormally high PGA (>1g) during the Tohoku earthquake, models of nonlinear soil behavior in the strong motion were constructed for 27 KiK-net stations located in the near-fault zones to the south of FKSH17. The method of data processing was used developed by Pavlenko and Irikura (2003) and previously applied for studying soil behavior at vertical array sites during the 1995 Kobe (Мw=6.8) and 2000 Tottori (Мw=6.7) earthquakes. During the Tohoku earthquake, we did not observe a widespread nonlinearity of soft soils and reduction at the beginning of strong motion and recovery at the end of strong motion of shear moduli in soil layers, as usually observed during strong earthquakes. Manifestations of soil nonlinearity and reduction of shear moduli during strong motion were observed at sites located close to the source, in coastal areas. At remote sites, where abnormally high PGA were recorded, shear moduli in soil layers increased and reached their maxima at the moments of the highest intensity of the strong motion, indicating soil hardening. Then shear moduli reduced with decreasing the intensity of the strong motion. At soft-soil sites, the reduction of shear moduli was accompanied by a step-like decrease of the predominant frequencies of motion. Evidently, the observed soil hardening at the moments of the highest intensity of the strong motion contributed to the occurrence of abnormally high PGA, recorded during the Tohoku earthquake. [ DOI ]

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