Ground-motion Significant Duration Characteristic of the Double Earthquakes on February 6,2023 in Turkey
On February 6,2023,two major earthquakes with magnitudes MW7.8 and MW7.5 struck the East Anatolia fault zone in Turkey.Engineering structures are more susceptible to failure during earthquake sequences,as observed in seismic damage investiga-tions.In this study,we developed a ground-motion regression model that incorporates duration parameters for the 5％～75％significant duration(DS5-75)and the 5％～95％significant duration(DS5-95),using 311 datasets and applying the random effects regression method.The validity of the prediction equations was verified by comparing them with existing research results.Our findings indicate that the DS5-75 and DS5-95 values for the vertical component are significantly higher than those for the horizontal component in both earthquakes.Additionally,the growth rate of the predicted results increases more rapidly with rupture distance beyond 10 km when compared to oth-er models.The developed prediction equations and comparative results offer insights into the seismic damage assessments for the Tur-key earthquakes.The characteristics of significant duration in both horizontal and vertical ground motions presented in this paper help explain some aspects of the observed seismic damage.These findings also underscore the importance of studying the vertical signific-ant duration of ground motion,providing a valuable reference for future research on significant duration in earthquake sequences.
Turkish doublet earthquakesGround motionSignificant durationRupture distanceShear wave velocityRe-gression model
万方数据
维普
