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<p>On 6 February, 2023, two sequential earthquakes hit southeastern Türkiye, causing catastrophic damage and loss of life. The first severe earthquake, M<sub>w</sub> 7.7, occurred at 04:17 local time in the Pazarcık segment of the Eastern Anatolian Fault Zone, in Kahramanmaras. The second earthquake, M<sub>w</sub> 7.6, occurred approximately 9&#xa0;h later at 13:24 local time on the Çardak fault's north branch of the East Anatolian Fault Zone in Ekinozu-Elbistan (Kahramanmaraş). The first earthquake specifically ruptured more than a 300-km-long lateral strike slip fault and generating extreme ground motions with horizontal accelerations exceeding 2&#xa0;g, vertical accelerations surpassing 1&#xa0;g, and peak ground velocities reaching 216&#xa0;cm/s in the horizontal direction. This study presents a comprehensive analysis of strong ground motions recorded in the region heavily impacted by the successive Kahramanmaraş earthquakes, aiming to assess the relationship between these parameters and structural damage. To achieve this, the study focuses on multiple ground-motion intensity measures, including peak ground acceleration (PGA), peak ground velocity (PGV), Arias intensity (I<sub>A</sub>), Housner intensity (HI), horizontal acceleration response spectra (S<sub>a</sub>: T = 0.2&#xa0;s and T = 1.0&#xa0;s), acceleration spectrum intensity (ASI), velocity spectrum intensity (VSI), and power spectral density (PSD). Unlike previous studies that typically examined individual parameters or limited areas, this work systematically integrates these advanced measures with observed structural damage data across the most severely affected regions. This integrated approach has provided new insights into which parameters are most indicative of severe damage and offers valuable implications for seismic risk assessment and future code development in Türkiye.</p>

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The prominent strong ground motion parameters and their effects on structural damage during 6 February 2023, Kahramanmaras sequential earthquakes

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Ibrahim O. Dedeoglu

摘要

On 6 February, 2023, two sequential earthquakes hit southeastern Türkiye, causing catastrophic damage and loss of life. The first severe earthquake, Mw 7.7, occurred at 04:17 local time in the Pazarcık segment of the Eastern Anatolian Fault Zone, in Kahramanmaras. The second earthquake, Mw 7.6, occurred approximately 9 h later at 13:24 local time on the Çardak fault's north branch of the East Anatolian Fault Zone in Ekinozu-Elbistan (Kahramanmaraş). The first earthquake specifically ruptured more than a 300-km-long lateral strike slip fault and generating extreme ground motions with horizontal accelerations exceeding 2 g, vertical accelerations surpassing 1 g, and peak ground velocities reaching 216 cm/s in the horizontal direction. This study presents a comprehensive analysis of strong ground motions recorded in the region heavily impacted by the successive Kahramanmaraş earthquakes, aiming to assess the relationship between these parameters and structural damage. To achieve this, the study focuses on multiple ground-motion intensity measures, including peak ground acceleration (PGA), peak ground velocity (PGV), Arias intensity (IA), Housner intensity (HI), horizontal acceleration response spectra (Sa: T = 0.2 s and T = 1.0 s), acceleration spectrum intensity (ASI), velocity spectrum intensity (VSI), and power spectral density (PSD). Unlike previous studies that typically examined individual parameters or limited areas, this work systematically integrates these advanced measures with observed structural damage data across the most severely affected regions. This integrated approach has provided new insights into which parameters are most indicative of severe damage and offers valuable implications for seismic risk assessment and future code development in Türkiye.