Estimation of weak and strong ground motions based on diffuse field concept for earthquake for steps 2 and 3 of blind prediction exercise

Abstract For the accurate prediction of earthquake ground motions, investigation three elements in its process, namely source, path, and site effects, is crucial, their accuracy reliability should be evaluated. The Committee 6th Effect Surface Geology on Seismic Motion Symposium conducted a blind exercise to investigate estimating subsurface velocity structure related effect for predicting weak strong motions. We participated estimated motions that occurred during 2016 Kumamoto sequence. First, structures at target KUMA our reference EEB were identified based diffuse field concept (DFCe). reproduced observed horizontal-to-vertical spectral ratios earthquakes well considered able reproduce horizontal vertical amplification factors DFCe. Second, incident waves seismic bedrock estimated. amplitudes components from surface assuming generation single record linearity factor, even shaking. Finally, using bedrock, inverted structure, dynamic deformation characteristics distributed by organizer shallow soil sediments. smaller around 1 Hz larger 10 than ones. However, overall levels all corresponded Although several parameters require further research, such as damping factor sediments, we have shown proposed method can estimate blind. Graphical