EFFECTS OF ANOMALOUSLY WEAK AND STRONG AMPLIFICATION OF SEISMIC WAVES IN SOIL LAYERS, WITH THE EXAMPLE OF TWO STATIONS OF KIK-NET STRONG MOTION NETWORK OF JAPAN

DOI: 10.37153/2618-9283-2020-4-26-40

Authors:

Дещеревская Елена Владимировна Elena V. Deshcherevskaya
senior researcher, The Schmidt Institute of Physics of the Earth, The Russian Academy of Sciences (IPE RAS), Moscow, Russian Federation

Павленко Ольга Витальевна Olga V. Pavlenko

Dr. of Sci. (Phys. and Math.), Head of the Laboratory of Engineering Seismology and Interpretation of Seismic Observations No. 306, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. Moscow, Russian Federation

olga@ifz.ru

Rubric: Seismic zoning
Key words: seismic wave amplification, resonant phenomena, nonlinearity of soil behavior, models of soil behavior, KiK-net network
Annotation:

Experimentally observed effects of anomalously weak and strong amplification of seismic waves in soft subsurface soils are studied using the records of KiK-net seismic vertical arrays (of strong motion network of Japan). The amplification was estimated based on peak ground accelerations recorded during ~20 earthquakes at each station. To interpret the obtained results, we engaged models of soil behavior at these sites during the Tohoku earthquake on March 11, 2011.

The general conclusion that can be drawn from the obtained results is that the effect of the three mechanisms of seismic wave transformations in soil layers largely depends on the composition of the soil down to depths of ~100 m.

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