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This research examines the relationship between horizontal and vertical ground motions during the Noto Peninsula Earthquake.

February 28, 2026Journal of Japan Association for Earthquake Engineering0 citationsOpen Access

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

SMSatoshi MORIO YKYoshinori Katō TBTirawat Boonyatee

Key Points

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.

Abstract

令和6年能登半島地震において水平方向加速度波形にスパイク状の波形が出現するK-NET富来とK-NET穴水の強震記録にみられる水平動と上下動の連成について考察を加えた．この結果，K-NET富来では表層地盤（火山灰質粘性土のダイレイタンシーによる下向き上下動加速度（体積膨張）が発生し，発生した上下動と水平動が強く連成することを示す．K-NET穴水では地下水位より深い飽和高有機質土（ピート）のCyclic Mobility現象を伴う非排水せん断と地下水位より浅い表層地盤の排水せん断による水平動と上下動の連成が重なり，スパイク状の波形が生じたと考えられる．

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MORIO et al. (2026) studied this question.

synapsesocial.com/papers/69a287350a974eb0d3c02b95 https://doi.org/10.5610/jaee.26.1_19

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February 28, 2026Journal of Japan Association for Earthquake Engineering0 citationsOpen Access

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

SMSatoshi MORIO YKYoshinori Katō TBTirawat Boonyatee

Key Points

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.

Abstract

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Cite This Study

MORIO et al. (2026) studied this question.

synapsesocial.com/papers/69a287350a974eb0d3c02b95 https://doi.org/10.5610/jaee.26.1_19

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