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Mechanisms of generation of abnormally high PGA during the Tohoku earthquake
The Tohoku earthquake possessed some important features including high PGA reaching ~3g
The ‘shock wave’ mechanism can explain all the features of the Tohoku earthquake
During the Tohoku earthquake, 19 stations recorded high peak accelerations exceeding 1g, the highest reaching ~3g. Based on records of vertical arrays KiK-net, we studied soil behavior during the earthquake and revealed its ‘atypical’ pattern: instead of being reduced in the near-source zones as usually observed during strong earthquakes, shear moduli in soil layers increased, indicating soil hardening, and reached their maxima at the moments of the highest intensity of strong motion, then reduced. We could explain this assuming that soils experienced some additional compression, caused by a certain factor. The observed changes in the shapes of acceleration time histories with distance from the source, such as, decrease of the duration and increase of the intensity of strong motion, indicate phenomena similar to shock wave generation, which led to the compression of soils and occurrence of PGA on the surface.
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