西日本深层变质岩斜坡的地震放大响应特征研究

doi:10.3724/1000-6915.jrme.2025.0585

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Abstract Deep-seated slopes, characterized by complex geological structures and deeply incised topography, are widely distributed in the metamorphic rock terrains of the Shikoku region in western Japan. This study aims to elucidate the correlation between seismic ground motion amplification and co-seismic instability mechanisms in such slopes, focusing specifically on the Azue metamorphic rock slope located in Tokushima Prefecture. Utilizing dense microtremor observations, geophysical surveys, geological investigations, and geo-mechanical testing, we systematically analyzed the seismic response characteristics of potentially unstable slope blocks using the horizontal-to-vertical spectral ratio (HVSR) method and Time-Frequency Polarization Analysis (TFPA). The key findings are as follows: (1) The slope exhibits a multi-scale resonance structure: low-frequency resonance (3–5.5 Hz) is governed by deep-seated wave impedance interfaces, with variations in resonance amplitude (HVSR) among blocks indicating systematic differentiation in the deep structure; high-frequency resonance (8–12 Hz) correlates with shallower interfaces and demonstrates relatively uniform transitions; mid-frequency resonance (6.5–7.5 Hz) is triggered by a low-dissipation “resonant cavity” formed by a surface fracture system, resulting in discrete anomalous distributions. (2) The predominant direction of deep-seated resonance aligns with the strike of high-stiffness joints, while shallow resonance is parallel to the slope′s free face direction, reflecting the influence of stress state on wave impedance anisotropy. The fracture system induces localized resonance perpendicular to its strike. (3) Pre-existing weak layers within the slope mass transform into resonance layers exhibiting distinct wave impedance contrasts during seismic shaking, which dominate ground motion amplification and strength degradation. The synergistic amplification of seismic forces by deep, shallow, and surface “cavity” resonances predisposes the slope to large-scale bedrock sliding and shallow local instability, respectively. This investigation of the multi-scale ground motion amplification response provides a novel framework for understanding the failure mechanisms of complex deep-seated slopes during earthquakes.

Key words： slope engineering deep-seated metamorphic slop microtremor observation seismic amplification response polarization co-seismic instability

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	MA Ning1
	2
	WANG Gonghui3*

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MA Ning1,2,WANG Gonghui3*. Seismic amplification site response on a deep-seated metamorphic slope in Southwest Japan[J]. , 2026, 45(7): 2061-2081.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0585 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I7/2061

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