Characteristics of strong ground motions and structural damage patterns from the February 6th, 2023 Kahramanmaraş earthquakes, Türkiye

• DOI: 10.1007/s11069-024-06856-y
• Publication Date: 2024-08-16T02:02:01Z
• Authors: Aybige Akinci; Ahmet Anil Dindar; Ihsan E. Bal; Deniz Ertuncay; Eleni Smyrou; Daniele Cheloni
• Keywords: Natural hazard

Abstract On February 6th, 2023, two severe earthquakes struck southeastern Türkiye near the Syrian border. The first earthquake, Mw7.8, occurred at 04:17 local time in East Anatolian Fault Zone city of Gaziantep. second Mw7.5, approximately 9 h later 13:24 Elbistan County, Kahramanmaraş province. These seismic events ruptured multiple segments (EAFZ), with rupture lengths exceeding 300 km, and deformation 5 m on both sides faults. In this study, we aim to analyze characteristics strong ground motion induced by mainshocks, focusing intensity measures such as peak acceleration (PGA), velocity (PGV), pseudo-acceleration response spectra (PSA). earthquake produced extremely high PGA values horizontal (> 2 g) vertical 1 components. At field distances, large PGVs are measured 180 cm/s) more than 30 impulsive motions which may indicate source-related effects. Large spectral demands also recorded for earthquakes, partially underestimated Ground Motion Models (GMMs), especially near-field. Specifically, compare PSA directions design provided new previous Turkish building codes. We present damage observations that provide insights into observed heavily damaged areas.