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| Formation mechanism and peak distribution of seismic motions in superposition areas with an incident P wave at the interface |
| HE Weiping1,2,3，LI Xiaojun2，DU Xiuli2，YAO Huiqin1,3 |
| 1.Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang 443002, China;
2.Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China;
3.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China |
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Abstract To provide theory support for the time-domain interpretation of seismic motions, the formation mechanism and spatial variation of motions near the interface under incident plane P wave is investigated in this paper. The spatial domains and boundaries between domains are investigated based on the superposition relation of seismic waves. Then, the analytical expression of particle motion is investigated and the component waves to particle motion are defined as the component sequence. The component sequence and peak value distribution are illuminated in different cases. The result shows that the near field and the far field are respectively the superposition area and the separation area. The component sequence of motion varies with spatial domains. In the superposition domain, the particle motion contains no wave, single wave, double wave, and triple wave periods. In the separation domain, the particle motion contains no wave and single wave periods. The peak distribution near the interface is divided into two types: the mountain type that is formed by the same sign wave components, and the valley type that is formed by different sign wave components. In studied cases, the maximum peak difference near the interface is 2.589.
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Received: 02 August 2022
Published: 28 September 2023
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