Near-field ground motion includes directivity, fling-step, hanging wall, vertical amplification, and pulse-like effects. The pulse-like ground motion contains high energy content, leading to increased ductility demand and peak elastic response of the structures. Recently, Turkey and Syria regions experienced two devasting earthquakes of magnitude ( \({M}_{w}\) ) 7.8 and 7.5, respectively, containing a substantial amount of near-field pulse-like ground motion records. In this study, we identified the stations having pulse-like records from the time histories available for the Turkey events in the ESM database using the method proposed by Shahi and Baker (2014). We observed a total of 21 and 8 pulse-like records for 7.8 and 7.5 \({M}_{w}\) events, respectively. Further, we evaluated the major characteristics of the observed pulse-like ground motion in terms of peak ground acceleration (PGA), peak ground velocity (PGV), arias intensity ( \({I}_{a})\) , , pulse time-period ( \({T}_{p})\) , , pulse velocity ( \({V}_{p})\) , , pulse duration ( \({T}_{p})\) , , and occurrence time for peak pulse value ( \({t}_{\text{max}\_p})\) and reported their statistical and spatial properties. We found a general decreasing trend in case of PGA, PGV, \({I}_{a,}\) and \({V}_{p}\) , and increasing trend for \({T}_{p}\) , \({t}_{\text{max}\_p,}\) and duration with rupture distance ( \({R}_{rup})\) . Furthermore, we compared the prediction capabilities of various NGAwest2 GMMs in quantifying the pulse-like records from the Tukey events. We found that the NGA-West2 GMMs underpredict the ground motion as compared to the recorded data for PGA and PGV values. Furthermore, for several stations, we also observed a higher vertical-to-horizontal (V/H) PGA ratio as compared to the commonly used factor of 2/3rd. The results highlighted the importance of accounting for near-field factors to the GMMs to reliably quantify the corresponding seismic hazard and subsequent risk.

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Characteristics of Near-Field Pulse-Like Records for Turkey Twin Earthquakes

  • Varun Sharma,
  • Maheshreddy Gade,
  • J. Dhanya

摘要

Near-field ground motion includes directivity, fling-step, hanging wall, vertical amplification, and pulse-like effects. The pulse-like ground motion contains high energy content, leading to increased ductility demand and peak elastic response of the structures. Recently, Turkey and Syria regions experienced two devasting earthquakes of magnitude ( \({M}_{w}\) ) 7.8 and 7.5, respectively, containing a substantial amount of near-field pulse-like ground motion records. In this study, we identified the stations having pulse-like records from the time histories available for the Turkey events in the ESM database using the method proposed by Shahi and Baker (2014). We observed a total of 21 and 8 pulse-like records for 7.8 and 7.5 \({M}_{w}\) events, respectively. Further, we evaluated the major characteristics of the observed pulse-like ground motion in terms of peak ground acceleration (PGA), peak ground velocity (PGV), arias intensity ( \({I}_{a})\) , , pulse time-period ( \({T}_{p})\) , , pulse velocity ( \({V}_{p})\) , , pulse duration ( \({T}_{p})\) , , and occurrence time for peak pulse value ( \({t}_{\text{max}\_p})\) and reported their statistical and spatial properties. We found a general decreasing trend in case of PGA, PGV, \({I}_{a,}\) and \({V}_{p}\) , and increasing trend for \({T}_{p}\) , \({t}_{\text{max}\_p,}\) and duration with rupture distance ( \({R}_{rup})\) . Furthermore, we compared the prediction capabilities of various NGAwest2 GMMs in quantifying the pulse-like records from the Tukey events. We found that the NGA-West2 GMMs underpredict the ground motion as compared to the recorded data for PGA and PGV values. Furthermore, for several stations, we also observed a higher vertical-to-horizontal (V/H) PGA ratio as compared to the commonly used factor of 2/3rd. The results highlighted the importance of accounting for near-field factors to the GMMs to reliably quantify the corresponding seismic hazard and subsequent risk.