On the Coupling of Horizontal and Vertical Motions Observed in the Strong Earthquake Records during the Noto Peninsula Earthquake

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This research examines the relationship between horizontal and vertical ground motions during the Noto Peninsula Earthquake.
Analyzed strong ground motion records from K-NET Tomari and K-NET Anamizu.
Focused on acceleration waveforms exhibiting spike patterns.
Investigated geotechnical factors influencing ground behavior, including shear strength and cyclic mobility.
K-NET Tomari displayed significant coupling between downwards vertical movement and horizontal motion due to surface layer characteristics.
At K-NET Anamizu, the combination of drainage and non-drainage shear behavior in organic-rich soils led to complex motion coupling.

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Observations reveal coupled horizontal and vertical motions in ground acceleration during an earthquake, indicating complex geotechnical behaviors.

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MORIO et al. (2026) studied this question.

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