מושגי ליבה
A method is proposed to select a credible 3D ground structure model from a pool of candidate models by utilizing seismic ground motions observed at the surface and conducting 3D seismic wave propagation analysis.
תקציר
The study aims to develop a method for selecting a credible 3D ground structure model from a pool of candidate models generated using geotechnical engineering methods. The key insights are:
- Many methods exist for generating 3D ground structure models, but their reliability in reproducing observed seismic ground motions varies substantially.
- The proposed method utilizes seismic ground motions observed at the surface and conducts 3D seismic wave propagation analysis to evaluate the ability of candidate 3D ground structure models to reproduce the observed seismic motions.
- Through numerical experiments, the method is shown to be effective in systematically selecting a credible 3D ground structure model that can accurately reproduce the observed seismic ground motions.
- The selected 3D ground structure model can then be used to evaluate seismic ground motions with sufficient accuracy, which is crucial for mitigating earthquake-induced damage.
- The study leverages fast 3D seismic wave propagation analysis on GPUs to enable the evaluation of a large number of candidate 3D ground structure models within a feasible timeframe.
סטטיסטיקה
The numerical experiment used seismic ground motion data from 6 earthquake events with magnitudes ranging from 4.6 to 6.0 and depths from 10 to 80 km.
A total of 236 candidate 3D ground structure models were generated using an inverse distance weighting method based on 120 survey points.
ציטוטים
"Even when ground models are generated using methods based on geotechnical engineering aspects, their performance in reproducing observed ground motion varies substantially."
"A comparison of simulation results between models exhibiting high and low performance underscored substantial differences in seismic damage estimation during earthquakes, highlighting the efficacy of our method."