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<p>On February 6, 2023, two destructive earthquakes occurred in Türkiye, namely, the Pazarcık earthquake with moment magnitude 7.9 and the Elbistan earthquake with moment magnitude 7.6. A larger number of strong motion recordings were obtained in both events, facilitating the examination of their ground motion characteristics. Using four ground-motion prediction equations (GMPEs)—two regional and two global—we computed total residual (<i>R</i><sub>es</sub>), between-events residual (<i>δB</i><sub><i>e</i></sub>), within-event residual (<i>δW</i><sub><i>es</i></sub>) and adjustment coefficient of anelastic attenuation (<i>Δc</i><sub>3</sub>), for peak ground acceleration (PGA), pseudo-spectral accelerations (PSAs) and 5–95% significant duration. Both regional and global GMPEs exhibit period- and distance-dependent for <i>R</i><sub>es</sub>, which can be attributed to discrepancy in tectonic settings and geological conditions among different regional datasets used in their development, leading to variations in ground motion. Predominantly negative <i>δB</i><sub><i>e</i></sub> values at periods <i>T</i> &lt; 0.2&#xa0;s for both earthquakes (except for positive values in the Pazarcık event for the Kale2015 model) indicate: source effects are weaker than the average levels represented by the GMPEs, and stronger than those characterized by specific-regional model Kale2015 for the Pazarcık earthquake. The observed increasing trend in <i>δB</i><sub><i>e</i></sub> values at periods <i>T</i> &gt; 0.6&#xa0;s, which can be attributed to supershear rupture (via Mach wave amplification) and forward rupture directivity. Predominantly negative <i>Δc</i><sub>3</sub> values (Pazarcık earthquake: −0.0002 to −0.0073; Elbistan earthquake: −0.0001 to −0.0204) indicate faster anelastic attenuation in the affected zone of both earthquakes than regional averages presented by all GMPEs, aligning with prior studies of the East Anatolian Fault. These results provided valuable insights for improving regional seismic hazard models.</p>

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Characteristic in ground motions between the Mw7.9 Pazarcık earthquake and the Mw7.6 Elbistan earthquake in Türkiye

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Peibin Xu,
  • Xingguo Liu,
  • Lin Li

摘要

On February 6, 2023, two destructive earthquakes occurred in Türkiye, namely, the Pazarcık earthquake with moment magnitude 7.9 and the Elbistan earthquake with moment magnitude 7.6. A larger number of strong motion recordings were obtained in both events, facilitating the examination of their ground motion characteristics. Using four ground-motion prediction equations (GMPEs)—two regional and two global—we computed total residual (Res), between-events residual (δBe), within-event residual (δWes) and adjustment coefficient of anelastic attenuation (Δc3), for peak ground acceleration (PGA), pseudo-spectral accelerations (PSAs) and 5–95% significant duration. Both regional and global GMPEs exhibit period- and distance-dependent for Res, which can be attributed to discrepancy in tectonic settings and geological conditions among different regional datasets used in their development, leading to variations in ground motion. Predominantly negative δBe values at periods T < 0.2 s for both earthquakes (except for positive values in the Pazarcık event for the Kale2015 model) indicate: source effects are weaker than the average levels represented by the GMPEs, and stronger than those characterized by specific-regional model Kale2015 for the Pazarcık earthquake. The observed increasing trend in δBe values at periods T > 0.6 s, which can be attributed to supershear rupture (via Mach wave amplification) and forward rupture directivity. Predominantly negative Δc3 values (Pazarcık earthquake: −0.0002 to −0.0073; Elbistan earthquake: −0.0001 to −0.0204) indicate faster anelastic attenuation in the affected zone of both earthquakes than regional averages presented by all GMPEs, aligning with prior studies of the East Anatolian Fault. These results provided valuable insights for improving regional seismic hazard models.