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<p>On February 6, 2023, consecutive M7.8 and M7.5 earthquakes struck southeastern Türkiye, which caused extensive damage to the local buildings and huge casualties. Some unique engineering characteristics of strong motion were observed during the processing of strong ground motion records. These characteristics provide suggestions for the seismic design of structures in the future. The paper analyzes the engineering characteristics of strong ground motion obtained in these earthquakes. This study systematically reveals the spectral acceleration amplification effect of damaged faults in the earthquake sequence, elucidates the impact characteristics of supershear ground motions, explicitly identifies the significant amplification feature of response spectrum values caused by acceleration pulses associated with the forward directivity of subshear ruptures, and simultaneously uncovers the nonlinear characteristics and liquefaction evolution of typical sites. Systematic comparisons reveal that supershear ruptures exhibit characteristics such as broad spectral width, slow attenuation, and significant low-frequency components in the far field.</p>

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Engineering characteristics of the strong ground motions from the 2023 Kahramanmaraş earthquake sequence in Türkiye 

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Yinfeng Dong,
  • Fuchao Cao,
  • Yiping Wang,
  • Yiming Xie

摘要

On February 6, 2023, consecutive M7.8 and M7.5 earthquakes struck southeastern Türkiye, which caused extensive damage to the local buildings and huge casualties. Some unique engineering characteristics of strong motion were observed during the processing of strong ground motion records. These characteristics provide suggestions for the seismic design of structures in the future. The paper analyzes the engineering characteristics of strong ground motion obtained in these earthquakes. This study systematically reveals the spectral acceleration amplification effect of damaged faults in the earthquake sequence, elucidates the impact characteristics of supershear ground motions, explicitly identifies the significant amplification feature of response spectrum values caused by acceleration pulses associated with the forward directivity of subshear ruptures, and simultaneously uncovers the nonlinear characteristics and liquefaction evolution of typical sites. Systematic comparisons reveal that supershear ruptures exhibit characteristics such as broad spectral width, slow attenuation, and significant low-frequency components in the far field.