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The effects on structures of the earthquake with magnitude 7.8 on the Richterscale (moment magnitude scale) which took place in Pazarcik, Kahramanmaras,Turkiye at 04:17 a.m. local time (01:17 UTC) on February 6, 2023, areinvestigated by processing suitable seismic records using the open-sourcesoftware OpenSeismoMatlab. The earthquake had a maximum Mercalli intensity ofXI (Extreme) and it was followed by a Mw 7.5 earthquake nine hours later,centered 95 km to the north-northeast from the first. Peak and cumulativeseismic measures as well as elastic response spectra, constant ductility (orisoductile) response spectra, and incremental dynamic analysis curves werecalculated for two representative earthquake records of the main event.Furthermore, the acceleration response spectra of a large set of records werecompared to the acceleration design spectrum of the Turkish seismic code. Basedon the study, it is concluded that the structures were overloaded far beyondtheir normal design levels. This, in combination with considerable verticalseismic components, was a contributing factor towards the collapse of manybuildings in the region. Modifications of the Turkish seismic code are requiredso that higher spectral acceleration values can be prescribed, especially inearthquake-prone regions.

Kahramanmaras-Gaziantep, Turkiye Mw 7.8 Earthquake on February 6, 2023: Preliminary Report on Strong Ground Motion and Building Response Estimations