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Localized ground deformation within the Aso caldera during the 2016 Kumamoto Earthquake: Combined effects of irregular basin geometry, soft lacustrine clay, and earthquake sequencing
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DOI：10.1016/j.soildyn.2026.110463.png)
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Abstract
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• Graben-type subsidence in the Aso Caldera is reproduced by 2D coupled analysis. • Irregular basin geometry causes wave focusing and long-period surface motions. • Soft, sensitive lacustrine clay shows severe stiffness degradation under cyclic loading. • Foreshock lengthens ground period, amplifying long-period mainshock response. • Sequential seismic loadings control damage severity in the Kumamoto Earthquake.
Keywords:
Aso caldera
Kumamoto Earthquake
Graben-type subsidence cracks
Irregular basin geometry
Soft and sensitive lacustrine clay
Sequential seismic loadings
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