Assessment on the co-seismic displacements (Mw > 6) of different faulting mechanisms as monitored by GNSS VADASE method and accelerometer data
Advances in Space Research, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.asr.2026.10.028
- Dergi Adı: Advances in Space Research
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Artic & Antarctic Regions, Compendex, INSPEC, MEDLINE, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Accelerometer, Co-seismic displacement, GNSS VADASE, Seismic monitoring, Time series analysis
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
In this study, a comparative analysis of co-seismic displacement motions obtained from high-speed accelerometer data using the single-receiver GNSS VADASE (Variometric Approach for Displacement Analysis Stand-Alone Engine) method was performed in five major earthquakes (Mw > 6) involving strike-slip, normal, and reverse faulting mechanisms. To examine the performance of VADASE, GNSS and accelerometer displacement series were processed with zero-phase bandpass filtering in a common frequency band of 0.02–0.40 Hz. Waveforms were compared in terms of Maximum Displacement, time delay, Signal-to-Noise Ratio, and low-frequency spectral energy conservation. The study shows a significant relative waveform agreement between VADASE and accelerometer solutions in the horizontal components, with average horizontal Root Mean Square Error (RMSE) values ranging from 0.50 to 3.75 cm within the common 0.02–0.40 Hz band. The observed differences in PGD timing were determined to be due to station-epicenter geometry, wave propagation, and local field conditions rather than algorithmic delay. Stepwise multiple linear regression analysis based on the Bayesian Information Criterion, performed on spectral energy ratios calculated in the 0–0.5 Hz frequency band, revealed that the VS30 parameter, representing local ground conditions, is more dominant than the SNR, representing GNSS signal quality. Conversely, the vertical VADASE component exhibits lower accuracy compared to the horizontal components due to the geodetic vertical noise level. In conclusion, this study demonstrates that the single-receiver GNSS VADASE method, when appropriate frequency matching is applied, can provide reliable horizontal co-seismic displacement solutions unaffected by base slip during strong ground motions and is a powerful technique complementing accelerometer systems.