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作者:

Fu, Lei (Fu, Lei.) | Chen, Su (Chen, Su.) | Xie, Zhinan (Xie, Zhinan.) | Wang, Suyang (Wang, Suyang.) | Chen, Junlei (Chen, Junlei.) | Li, Xiaojun (Li, Xiaojun.)

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摘要:

Despite their crucial importance for marine engineering, the nonlinear seismic response characteristics of offshore sites remain poorly understood. Consequently, simulating ground-motion at offshore sites poses a significant challenge. To address this, this study begins with a dataset comprising stress drops of 70 earthquakes, region-specific quality factors, and linear site amplification factors (AFs) of six offshore stations in Sagami Bay, Japan, obtained using the generalized inversion technique (GIT). Then, by incorporating additional offshore accelerograms with focal depths up to 333 km and peak ground accelerations (PGAs) ranging from 0.2 to 4.2 m/s2, we delve deeper into the effects of nonlinear site behaviors on the high-frequency attenuation parameter (κ0) and AFs, respectively. A counterintuitive decrease in κ0 was observed as the peak ground acceleration (PGA) reached 0.5–0.8 m/s2, echoing similar observations from previous studies on KiK-net stations. Our results indicate that the high-frequency attenuation characteristics of offshore sites vary under strong motions, potentially attributable to the nonlinear evolution of the frequency-independent quality factor and S-wave velocity within near-surface sediments. Additionally, the degree of nonlinearity (DNL) at these offshore stations exceeded 4 when PGA reached 0.2–0.3 m/s2, a threshold significantly lower than the previously reported range of 0.5–1.0 m/s2. Furthermore, we observed systematic variations in nonlinear behaviors between flat and steep offshore stations, particularly with peak frequencies shifting towards lower and higher frequencies, respectively. These new findings may be mainly attributed to the intricate interaction of topography and marine sediments. Finally, simulations of two subduction earthquakes (MW6.2 and 5.9) using the stochastic finite-fault simulation method (SFFSM) showed good agreement with observations at frequencies above 0.1 Hz. Notably, nonlinear AFs outperformed linear ones across a wide PGA range of 0.2–1.2 m/s2, highlighting the significance of nonlinear site behaviors in characterizing offshore ground-motions. This finding reinforces the potential of the simulation framework (integrating GIT and SFFSM) for effectively and accurately simulating offshore ground-motion. © 2024 Elsevier Ltd

关键词:

Earthquake effects Marine engineering Seismic waves Stochastic models Seismic response Error correction Shear waves

作者机构:

  • [ 1 ] [Fu, Lei]Institute of Geophysics, China Earthquake Administration, Haidian, Beijing; 100081, China
  • [ 2 ] [Chen, Su]Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing; 100124, China
  • [ 3 ] [Xie, Zhinan]Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Heilongjiang, Harbin; 150080, China
  • [ 4 ] [Wang, Suyang]Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing; 100124, China
  • [ 5 ] [Chen, Junlei]Faculty of Public Security and Emergency Management, Kunming University of Science and Technology, Yunnan, Kunming; 650031, China
  • [ 6 ] [Li, Xiaojun]Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing; 100124, China

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来源 :

Soil Dynamics and Earthquake Engineering

ISSN: 0267-7261

年份: 2025

卷: 188

4 . 0 0 0

JCR@2022

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