Durational Variability During the February 6, 2023, M7.8 Türkiye Kahramanmaraş Pazarcik Earthquake

Seismograms from 71 ground motion stations within 100 km of the fault rupture were used to investigate the durational variability observed during the February 6, 2023, M7.8 Türkiye-Kahramanmaraş-Pazarcık earthquake. The duration parameters estimated from the recordings and predicted by Tafreshi and Bora (Bull Earthq Eng 21:4139–4166, 2023) and Cetin et al. (Soil Dyn Earthq Eng 143, 2021) models were compared. The results showed significant differences between the duration parameters estimated from the recordings and the predictive equations for the cities of Hatay and Malatya. Hatay, located on forward directivity and fault rupture paths, experienced shorter duration and higher intensity levels. Kahramanmaraş, Adana, Osmaniye, Diyarbakır, and Elazığ cities experienced slightly longer significant durations than predicted. The overall mean residuals for stations on the Anatolian and Arabian plate sides of the fault rupture plane were estimated as −0.02 ± 0.54 and 0.37 ± 0.33, respectively. Residuals increased slightly with increasing rupture distances, more pronounced for significant duration. Site conditions did not significantly affect durational variability. A stronger dependency of inter-event residuals on azimuth angle θ was estimated, with residuals negative for θ < 5 degrees and positive for θ beyond 5 degrees. This observation confirmed the effects of directivity and/or rupture propagation velocity on the duration of seismic shaking during the Kahramanmaraş-Pazarcık event.