The Aleatory Variability of Response Spectrum Amplitude Near the Seismic Source Based on a Single-Site Ground Motion Model for Crustal Earthquakes in Japan

Key Points

• This study aims to assess the aleatory variability of response spectrum amplitudes near seismic sources in Japan and its dependence on various factors.
• Evaluated seismic response using a single-site ground motion model for inland crustal earthquakes in Japan.
• Analyzed residuals between predicted and observed ground motion values to assess variability.
• Investigated the dependency of variability on source distance, period, and type of deviation.
• Found that aleatory variability increases closer to the seismic source.
• Identified that trends in variability differ based on the type of deviation from expected patterns.
• Provided insights into enhancing the precision of ground motion assessments near sources.