Seismic Evaluation of Ground Motion Characteristics Following the 10 August 2025 Sındırgı Earthquake

Abstract

This study analyzes the ground motion characteristics of the 10 August 2025 Sındırgı (Mw 6.1) earthquake using multi-station records. Time-domain (PGA, PGV, PGD) and frequency-domain (response spectra, FFT-based dominant period) analyses were performed for ten stations in E-W, N-S, and U-D components. Stations were compared by epicentral distance (5-65 km) and site class (Vs30 ? ZC/ZD). Higher amplitudes were observed at near-fault stations, while station 4504 showed significant site amplification and possible directivity effects. Dominant periods correlated with Vs30 values. Observed PGA values showed good agreement with NGA-West2 GMPEs, especially for ZD sites (R2 = 0.82-0.88). Results emphasize the importance of considering local site and directivity effects along with epicentral distance in engineering design. © (2026), (Afet ve Acil Durum Yonetimi Baskanligi (AFAD)). All rights reserved.