Seismic Hazard Assessment of Cuttack District, Odisha, Using Regional Attenuation Models: A Case Study
摘要
This study conducts seismic hazard analyses for Cuttack district, Odisha, India, using deterministic and probabilistic methods focusing on an area within a 300 km radius of Cuttack City. An earthquake catalog spanning from 1837 to 2022 AD is prepared and homogenized using local empirical relationships, with catalog completeness assessed using the cumulative visual inspection (CUVI) method. Seismicity parameters and maximum magnitudes for different sources are evaluated. The ground motion generated by earthquakes near the faults in this region is assessed using ground motion predictive models tailored to local conditions. Each model is assigned a normalized weight based on the log-likelihood (LLH) approach to reflect its relative suitability. Seismic hazard is characterized by peak ground acceleration (PGA), and hazard curves are prepared, evaluating PGA values at 2%, 5%, and 10% probability of exceedance over 50 and 100 years. Uniform hazard spectra (UHS) are prepared within the spectral period range of 0.0–2.5 s. Comparisons with previous studies demonstrate excellent agreement with the obtained results. A map consisting of spatial variation of PGA values was prepared for the district, which shows that the PGA value in the district varies between 0.0392 and 0.102 g.